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* * * * * 17P/Holmes * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2014 9 22.66 S 14.3 UV 40.0L 257 0.6 4 YOS Kita-karuizawa, Gunma (Tiny and faint. Hard to imagine it brightened up to 2nd magn. in its last apparition.)
2008 4 23.92 S [6.2 TK 5.0R 6 !60 GON Alto del Castro - Aralla, León (Mountain location, very clear sky. Comet not seen with 6x50 monocular and 10x50B, washed out by the zodiacal light. Notwithstanding this, in 25x100B the observed diameter of the very faint coma was approximately 40' [not allowing a magnitude estimate], with a somewhat brighter area of about 15'.) 2008 4 3.90 S 5.4 TK 3.0R 4 60 0 GON Sierra del Aramo, Asturias (Mountain location, very clear sky. Zodiacal light. NEL about 6.5 near comet. Naked eye: comet faintly seen with direct vision.) 2008 3 30.87 S 5.2 TK 3.0R 4 60 0 GON Sierra del Aramo, Asturias (Mountain location, very clear sky. Zodiacal light. NEL about 6.0 near comet. Naked eye: comet faintly seen with direct vision, m1 was difficult to estimate due to stars inside the coma [mag. 6.4 and 6.8, TK].) 2008 3 29.81 S 6.0:HI 5.0B 7 50 0 NOV Konchezero 2008 3 28.93 S 5.2 TK 3.0R 4 60 0 GON Sierra de Penouta - Boal, Asturias (Suburban location, clear sky. Some light pollution in the area of the comet; NEL about 5.5. Comet not visible with the naked eye. Altitude:27 deg.) 2008 3 22.73 S 5.5:HI 3.0B 8 0 NOV Kondopoga 2008 3 10.94 S 4.5:TK 0.0E 1 &60 1 GON Sierra del Aramo, Asturias 2008 3 10.93 S 4.7 TK 3.0R 4 70 1 GON Sierra del Aramo, Asturias (Mountain location, very clear sky.) 2008 3 8.84 S 4.7 HI 5.0B 7 40 1/ NOV Konchezero 2008 3 7.903 S 5.3 TK 2.8R 3 &70 0 DIJ Noorddijk 2008 3 7.838 S 4.9:TK 0.0E 1 &75 0/ BOU Sint Annen (Comet seen with averted vision as a very faint, large, diffuse glow.) 2008 3 7.809 S 5.5:TK 5.0B 10 &70 0 COM Roden (Large elliptical structureless cloud, very difficult to estimate.) 2008 3 6.98 S 4.8 TK 3.0R 4 55 1 GON Sierra del Naranco - Oviedo, Asturias (Suburban location, very clear sky.) 2008 3 6.95 S 5.2 TJ 2.2R 5 &65 1/ PER Cabo da Roca (Comparisons with 40 Per, HIP 14043 and HIP 17460. 9th mag. stars in and around coma. Comet faintly visible with the naked eye. NEL=6.6 in area.) 2008 3 5.89 S 4.6 TK 3.0R 4 70 1/ GON Alto del Trichero - Soto y Amío, León (Comet faintly seen with direct vision.) 2008 3 5.86 S 5.0 TJ 2.2R 5 &80 1/ PER Cabo da Roca (Comparisons with π Per, 40 Per, HIP 14043 and HIP 17460. In 14x100 binoculars the coma [DC=2] could extended as much as 100' westwards. NEL=6.5 in area, zodiacal light seen up to about 40 deg above the horizon. Comet not visible with the naked eye.) 2008 3 5.45 S 4.7 YG 5.0R 10 80 1 YOS Mt. Hanadate, Ibaraki (I observed it after two months blank. Now it is hardly visible with naked eyes, only a hint of nebulous object was detectable. However, it is still very bright through a 5-cm refractor, the large nebulous diffuse comet is clearly visible.) 2008 3 5.001 S 5.2 TK 2.8R 3 &70 0 DIJ Noorddijk (Also seen with naked eye.) 2008 3 4.91 S 5.1 TJ 2.2R 5 &65 1/ PER Cabo da Roca (Comparisons with π Per, HIP 14043 and HIP 17460. Comet still possibly glimpsed with naked eye but could not be sure. NEL about 6.3 in area.) 2008 3 1.88 S 4.4 TK 3.0R 4 70 1/ GON Alto del Castro - Aralla, León (Comet faintly seen with direct vision.) 2008 3 1.86 S 4.9 TJ 2.2R 5 &65 1/ PER Cabo da Roca (Comparisons with π Per, HIP 14043 and HIP 17460. Mag 6.6 star in outer coma. Comet seen with the naked eye as a diffuse patch; the nearby mag 6.6 star is not visible tonight, but from checking alignments I am sure what was seen was the comet. NEL in the area about 6.3.) 2008 2 29.96 S 4.9 TJ 2.2R 5 &36 1/ PER Cabo da Roca (Comparisons with τ and π Per, plus HIP 14043. Mag 6.6 star in coma seriously hampering observation. Uncertainty in m1 +-0.2 mag. Comet not seen with the naked eye yet the mag 6.6 star is visible.) 2008 2 27.828 S 4.8 TK 2.8R 3 &70 0/ DIJ Sint Annen 2008 2 27.826 S 4.8 TK 2.8R 3 &70 1 BOU Sint Annen 2008 2 26.838 S 4.6 TK 2.8R 3 &70 1 DIJ Sint Annen 2008 2 26.836 S 4.7 TK 2.8R 3 &75 1 BOU Sint Annen 2008 2 25.86 S 4.8 TJ 2.2R 5 &60 2/ PER Cabo da Roca (Comparisons with τ and π Per, plus HIP 14043. Several mag 6-8 stars in and around coma. Comet and nearby star [V=6.45; B-V=+1.20] glimpsed with the naked eye, whilst another nearby star [V=6.60; B-V=+0.28] was not seen.) 2008 2 22.83 S 4.3 TK 0.0E 1 70 1 GON Aralla, León 2008 2 22.82 S 4.2 TK 3.0R 4 70 1/ GON Aralla, León (Mountain location, very clear sky. Estimates made before moonrise.) 2008 2 13.02 S 4.1 TK 3.0R 4 70 1/ GON Cueto Rosales - Riello, León (Comet still visible with naked eye. Mountain location, very clear sky. Estimate made after the moonset.) 2008 2 11.964 S 4.4 TK 2.8R 3 &70 0/ DIJ Sint Annen 2008 2 11.963 S 4.3 TK 2.8R 3 &95 1 BOU Sint Annen 2008 2 10.970 S 4.3 TK 2.8R 3 &70 0 DIJ Sint Annen 2008 2 10.967 S 4.4 TK 2.8R 3 &85 1 BOU Sint Annen (Comet still faintly visible naked eye as a large ill-defined glow, possibly as large as 2 degrees.) 2008 2 10.02 S 4.6 TJ 2.2R 5 &90 1 PER Cabo da Roca (Comparisons with τ and π Per, plus HIP 14043. The outer coma beyond about 60' diameter is extraordinarily faint but was suspected to about 105' diameter. Defocusing comp. stars to these extreme values yields m1=4.8 and m1=4.4 respectively.) 2008 2 9.903 S 4.4 TK 0.0E 1 &70 0 DIJ Noorddijk 2008 2 9.89 S 3.9 TK 3.0R 4 70 1/ GON Aralla, León (In 25x100B, coma diameter 90', elongated towards the very diffuse S.E. boundary. Inner brighter region ext. 30' from central condensation, on p.a. 110 deg.) 2008 2 9.843 S 4.4 TK 0.0E 1 &95 0/ BOU Sint Annen 2008 2 9.82 S 4.1 TK 1.8R 3 &90 1 GRA Hågår Obs., Eina (The comet was faintly, but definitely, seen with naked eye and it appeared similar in size but considerably fainter than M44. 17P was, however, quite easily seen through 3x18R and 7x50B as an ill-defined glow. Using the latter instrument, its surface brightness was markedly inferiour to that of M33. From images using DSLR and f=100mm lens its surface brightness was comparable with the Merope nebula in M45. The sky was dark [NEL about 6.5] but observering was shortly afterwards interrupted by fog.) 2002 2 9.781 S 4.6 TK 4.0R 10 90 1 LOO Genk 2008 2 9.44 S 4.7 AA 2.5B 2 80 SEA Cowra, NSW 2008 2 8.983 S 4.4 TK 2.8R 2 &80 0 DIJ Noorddijk 2008 2 8.97 S 4.7 TJ 2.2R 5 &90 0/ PER Cabo da Roca (Comparisons chiefly with τ and π Per, plus HIP 14043. The comet only became visible towards the end of my standard dark adaptation period [20-min].) 2008 2 8.823 S 4.6 TK 4.0R 10 90 1 LOO Genk 2008 2 8.774 S 4.4 TK 0.0E 1 &90 0/ BOU Bedum (Still visible to the naked eye, but very difficult, as a faint glow just above the sky background.) 2008 2 7.97 S 4.6 TJ 2.2R 5 &85 1 PER Cabo da Roca (Comparisons chiefly with τ and π Per, plus HIP 14043. Comet no longer visible with the naked eye. NEL=6.6 in area.) 2008 2 7.85 S 13.4 HS 40.7L 233 1.0 3 BIV Blieux (Additionnal estimate of the residual small comet of ~1' diameter embedded in the large and diluted dust halo.) 2008 2 7.847 S 4.6 TK 4.0R 10 60 1 LOO Genk 2008 2 7.84 S 4.5 HV 0.0E 84 1 BIV Blieux 2008 2 7.44 S 4.7 AA 2.5B 2 SEA Cowra, NSW 2008 2 6.95 S 4.6 TJ 2.2R 5 &70 0/ PER Cabo da Roca (Comparisons chiefly with τ and π Per, plus HIP 14043. Comet near the limit of naked eye visibility. Good dry conditions, NEL=6.6 in area.) 2008 2 6.94 S 3.8 TK 3.0R 4 70 1/ GON Aralla, León 2008 2 6.868 S 4.3 TK 2.8R 2 &90 0/ BOU Sint Annen 2008 2 6.861 S 4.1 TK 2.8R 2 &90 0 DIJ Sint Annen 2008 2 5.94 S 13.0 HS 40.7L 233 0.8 2 BIV Blieux (Additionnal estimate of the residual small comet of ~1' diameter embedded in the large and diluted dust halo.) 2008 2 4.94 S 3.9 TK 3.0R 4 70 1 GON Linares - Proaza, Asturias 2008 2 4.93 S 4.3 HV 0.0E 90 1 BIV Blieux 2008 2 4.87 S 4.5 TJ 2.2R 5 &80 1 PER Cabo da Roca (Comparisons chiefly with τ and π Per, plus HIP 14043. Comet seen with the naked eye [Diam. 1.5 deg. DC=0/]. Good transparency, NEL=6.1 in area, cirrus elsewhere in the sky not affecting observation. In 14x100B, Diam. 1.5 deg. [nearly half of the field!] DC=0/ broad >2 deg long tail.) 2008 2 4.849 S 4.2 TK 2.8R 2 &90 0/ BOU Sint Annen 2008 2 4.834 S 4.0 TK 2.8R 2 &90 0 DIJ Sint Annen 2008 2 2.99 S 4.2 HV 0.0E 90 1 BIV Blieux 2008 2 2.84 S 4.3 TJ 2.2R 5 &70 3 PER Cabo da Roca (Comparisons with τ, ι and π Per, plus HIP 14043. Magn. 6-8 stars in and around coma, hampering diameter estimate. Comet seen between two magn. 6.0 stars with the naked eye.) 2008 2 2.81 S 3.9 TK 3.0R 4 70 1 GON Para - Peñamellera Baja, Asturias 2008 2 2.768 S 4.2 TK 0.0E 1 &100 0/ BOU Garnwerd 2008 2 2.767 S 4.2 TK 0.0E 1 &90 0/ DIJ Noorddijk 2008 2 1.822 S 4.0 TK 0.0E 1 &90 0/ DIJ Noorddijk 2008 1 31.95 S 4.1 TJ 2.2R 5 >70 3 PER Cabo da Roca (Comparisons chiefly with τ and π Per. Large cc superimposed on a larger and fainter outer coma. Mag 6-7 stars around coma hampering diameter estimate. Comet visible with naked eye.) 2008 1 30.961 S 4.1 TK 0.0E 1 &90 0/ DIJ Groningen 2008 1 30.88 S 4.2 HV 0.0E 75 1 BIV Rambouillet 2008 1 30.761 S 4.1 TK 0.0E 1 &110 0/ BOU Bedum (Still faintly visible with naked eye next to Algol as a very large and diffuse glow, somewhat elongated towards roughly p.a. 120 deg.) 2008 1 29.83 S 3.8 TK 3.0R 4 65 1 GON Los Veneros - Sierra del Aramo, Asturias 2008 1 28.92 S 4.0 TJ 2.2R 5 &84 3 PER Cabo da Roca (Comparisons with τ and π Per, plus ε Cas. 25' cc superimposed on an extraordinarily large and faint outer coma. Magn. 7 star in coma plus bright stars near edge. Comet visible with naked eye. NEL=6.3 in area.) 2008 1 27.87 S 3.7 TK 3.0R 4 65 1 GON Alto del Castro - Aralla, León 2008 1 27.82 S 4.3 HV 0.0E 72 1 BIV Rambouillet 2008 1 26.83 S 3.7 TK 3.0R 4 65 1 GON Sierra del Aramo, Asturias (Mountain location, very clear sky. In 25x100B, coma 80x105' elongated towards the diffuse S.E. boundary. Inner brighter region ext. 40' from cc, on p.a. 120 deg.) 2008 1 26.81 S 3.8 TJ 2.2R 5 &80 2 PER Cabo da Roca (Comparisons with γ, τ and π Per, plus ε Cas. β Per no longer a significant nuisance. Comet near limit of naked eye visibility, whilst a nearby mag 6.0 star [combined mag of double] is easily seen.) 2008 1 26.76 S 3.9 TK 5.0R 8 &80 1 GRA Tryvann, Oslo (Using 8x50R and 7x50B, the comet appeared as an elongated glow of about the same surface brightness as M33. This was not an easy observation for several reasons; 17P's faint glow and location near Algol, some light pollution and interference from high clouds [NEL about 5.5]. The comet was however, seen with certainty, and also faintly detected using 3x18R.) 2008 1 25.87 S 4.0 TJ 2.2R 5 &75 3 PER Cabo da Roca (Comparisons with γ, τ and &pi Per;, plus ε Cas. β Per hampering estimate. A small non-stellar cc is visible. I took great care to check whether this was a ghost from β Per, and it is visible at the same location while moving the instrument around the field. This feature is similarly visible in 14x100 binoculars and naked eye, and there is no background star at the current position. Maybe the fading coma [or the dimmed coma due to β Per] is leaving this inner area more prominent by contrast. For many weeks the coma has looked very uniform, with a flat brightness profile in the 5x22 monocular, so tonight it was quite a dramatic change. Thin cirrus nearby.) 2008 1 24.83 S 3.9 TJ 2.2R 5 &75 1 PER Cabo da Roca (Comparisons with γ, τ and π Per, plus ε Cas. β Per hampering coma diameter and m1 estimate. Comet still seen with the naked eye. Thin cirrus nearby.) 2008 1 24.806 S 4.0 TK 0.0E 1 &90 0 DIJ Noorddijk 2008 1 18.83 S 4.2 TJ 2.2R 5 &45 2 PER Cabo da Roca (Comparisons with τ and π Per. Moon nearby behind house. +-0.2 mag uncertainty in m1, essentially due to ill defined coma edges and comet near limit of visibility.) 2008 1 13.915 S 3.7 TK 0.0E 1 &95 1/ BOU Sint Annen (Large very diffuse object, somewhat elongated towards approx. p.a. 130 deg. Nearby Algol is starting to interfere.) 2008 1 13.896 S 4.2 TK 0.0E 1 &100 1 COM Kongens Lyngby, Denmark (Comet very elongated; difficult close to Algol and some townlight.) 2008 1 13.45 S 4.6 AA 3.5B 6 50 SEA Cowra, NSW (Weak moonlight at time of observation.) 2008 1 13.00 S 3.4 TK 3.0R 4 70 2 GON La Cortina - Lena, Asturias 2008 1 12.776 S 3.7 TK 0.0E 1 &95 1/ BOU Bedum 2008 1 12.77 S 3.7 HV 0.0E 1 60 1 BIV Versailles 2008 1 12.75 S 3.7 TK 0.0E 1 &90 1 GIL Noordwijk aan Zee 2008 1 12.03 S 3.8 TJ 2.2R 5 >65 0/ PER Cabo da Roca (Comparisons with τ Per and ε Cas. Coma extension difficult to assess given the proximity to β Per [could be as large as 1.4 deg., the tabulated diam. being a conservative estimate]. Further, as the rather ill defined outer coma edges could translate into larger uncertainty in the m1 estimate, I have been making additional m1 estimates with different defocusings to match the range of uncertainty in the coma diameter. Nevertheless, I still get m1 within about +-0.1 mag of the value I report. The comet remains an easy naked eye object [diam. about 1.1 deg., DC=1], in fact it was even visible from indoors through a double glaze glass window as I was beginning dark adaptation before going outside to make the observation.) 2008 1 11.89 S 3.7 TK 1.8R 3 &85 0/ GRA Fjellhamar (Comet was visible as a faint glow and not detected with naked eye. Observing was challengig due to a rather bright sky background. NEL was about 5.2.) 2008 1 11.45 S 4.2 AA 0.0E 1 SEA Cowra, NSW 2008 1 10.89 S 3.9:HV 0.0E 1 60 1 BIV Versailles 2008 1 10.80 S 3.4 TK 3.0R 4 70 1/ GON Grandota, Oviedo, Asturias (Suburban location, clear sky. In 25x100B, coma 70x80' elongated towards the diffuse S.E. boundary. Inner brighter region ext. 30' from cc, on p.a. 130 deg.) 2008 1 10.45 S 4.0 AA 0.0E 1 SEA Cowra, NSW (Very large and diffuse. Some haze in sky.) 2008 1 9.92 S 3.4 TK 3.0R 4 90 2 GON Cueto Rosales - Riello, León (In 25x100B, coma 70x90' elongated towards the diffuse SE boundary. Inner brighter region ext. 35' from cc, on p.a. 130 deg. Broad tail-like feature extending 1.8 deg from center in p.a. 130 deg.) 2008 1 9.770 S 3.5 TK 0.0E 1 &90 1/ DIJ Engelbert 2008 1 9.763 S 4.0:TK 0.0E 1 &80 1/ COM Roden (Very elongated structureless object, close to Algol.) 2008 1 7.874 S 3.8:TK 0.0E 1 &90 1/ COM Roden 2008 1 7.863 S 3.6 TK 0.0E 1 &85 1/ BOU Noordwolde 2008 1 7.802 S 3.6 TK 2.8R 2 &90 1/ DIJ Noorddijk (Comet is about 1.5x1.8 deg., elongated in p.a. 128 deg.) 2008 1 6.81 S 3.3 TK 3.0R 4 80 2 GON Barres - Castropol, Asturias (Near sea level location, clear sky.) 2008 1 6.762 S 3.5 TK 0.0E 1 &90 1/ BOU Bedum 2008 1 6.726 S 3.5 TK 0.0E 1 &60 1/ DIJ Gent, Belgium 2008 1 6.726 S 4.5 TK 4.0R 10 44 1 LOO Genk 2008 1 4.65 S 3.9 HI 5.0B 7 70 1/ NOV Kondopoga 2008 1 4.45 S 3.6 YG 5.0R 10 85 2 YOS Mt. Hanadate, Ibaraki 2008 1 4.45 S 3.3 YG 0.0E 1 100 D1 YOS Mt. Hanadate, Ibaraki (Very bright in the mountain location! Easy object with naked eyes, and extraordinary large. Evidently brighter than 4 mag stars, so the comet is still around 3.5 mag!) 2008 1 4.05 S 3.5 HV 0.0E 1 78 1 BIV Pico-Veleta, Spain 2008 1 4.03 S 3.5 TJ 2.2R 5 &78 0 PER Cabo da Roca (Comparisons with γ and τ Per, and ε Cas. Several stars in coma [the brightest being mag 6.6] hampering the DC estimate; the comet remains an easy naked eye object, diam. about 1.3 deg., DC=2.) 2008 1 3.83 S 3.5 TK 1.8R 3 85 1 GRA Steinkjer (Elongated coma with major axis directed towards approx. 160 deg. Visible to naked eye despite some light pollution [NEL about 5.5].) 2008 1 3.80 S 3.4 TK 3.0R 4 80 2 GON Sierra del Aramo, Asturias (In 25x100B, coma 80x100' elongated towards the diffuse southern boundary. Inner brighter region ext. 50' from cc, on p.a. 140 deg. Broad tail-like feature extending 2.5 deg from center in p.a. 140 deg.) 2008 1 3.63 S 4.0 HI 5.0B 7 70 1/ NOV Kondopoga 2008 1 3.46 S 4.0 YG 5.0R 10 75 1 YOS Fujishiro, Toride City, Ibaraki (In the city, the comet looked faint due to the light pollution, which caused my estimation fainter.) 2008 1 2.803 S 4.5: 4.0R 10 40 1 LOO Genk 2008 1 2.65 S 3.7 HI 5.0B 7 60 2 NOV Kondopoga 2008 1 2.51 S 4.0 YG 6.6R 10 &55 1 YOS Yokohama City, Kanagawa 2008 1 1.99 S 3.5 HV 0.0E 1 72 2 BIV Pico-Veleta, Spain 2008 1 1.954 S 3.5 TK 0.0E 1 &80 1/ BOU Noordwolde 2008 1 1.935 S 3.4 TK 2.8R 2 &70 2/ DIJ Noorddijk 2008 1 1.67 M 3.6 HI 0.7E 1 65 2 NOV Konchezero 2008 1 1.66 B 4.0 YG 4.5B 12 &80 1/ CHE Saransk 2008 1 1.46 S 3.7 YG 6.6R 10 52 2 YOS Yokohama City, Kanagawa 2008 1 1.08 S 3.6 TJ 2.2R 5 &60 1/ PER Cabo da Roca (Comparisons with γ and τ Per, and ε Cas. Good transparency. In 5x22 monocular the outer coma was suspected to 90', yet was extremely vague beyond the tabulated 60'; the sharp outline and parabolic shape apparent in current images, is not perceived in the instrument used for the m1 estimate. The comet is still an easy naked eye object: diam. about 80', DC=2.) 2008 1 1.04 S 3.2 TK 3.0R 4 75 2 GON Dosango - Santo Adriano, Asturias 2008 1 1.01 S 3.5 HV 0.0E 1 78 2 BIV Pico-Veleta, Spain 2007 12 31.763 S 3.4 TK 0.0E 1 &75 1 BOU Noordwolde 2007 12 31.76 S 3.5:HI 5.0B 7 65 2 NOV Konchezero 2007 12 31.732 S 3.3 TK 2.8R 2 &70 2 DIJ Noorddijk 2007 12 31.47 S 3.8 YG 6.6R 10 &60 1 YOS Yokohama City, Kanagawa (In the clear sky, the central bright part was clearly visible, extending elliptically.) 2007 12 31.03 S 3.5 HV 0.0E 1 72 2 BIV Pico-Veleta, Spain 2007 12 30.93 S 3.6 TJ 2.2R 5 &66 2 PER Cabo da Roca (Comparisons with γ and τ Per, and ε Cas. With naked eye: Diam. about 1.3 deg., DC=2/.) 2007 12 30.91 S 3.5 TK 0.0E 1 &70 1 GIL Noordwijk aan Zee (In 10x50B, coma about 85x60'.) 2007 12 30.86 S 3.5 TK 1.8R 3 80 1 GRA Tryvann, Oslo (Also faintly seen with naked eye. Some light pollution from Oslo, otherwise favourable conditions [NEL 5.5-6.0]. As a comparison to the 8P/M33 image, this comet was also pictured, exp. 6 sec. ISO 800, using the same equipment [Canon EOS 400D and a 100-mm f/2 objective]; the field was 13 deg. x 8.5 deg.) 2007 12 30.835 S 3.7:TK 0.0E 1 &70 1 COM Kongens Lyngby, Denmark 2007 12 30.81 S 3.1 TK 3.0R 4 75 2 GON Aralla, León (In 25x100B, coma 75x95' elongated towards the diffuse southern boundary; inner brighter region ext. 50' from cc, on p.a. 145 deg; broad tail-like feature extending 2.5 deg from center in p.a. 145 deg.) 2007 12 30.776 S 3.3 TK 2.8R 2 2 BOU Sint Annen (Coma about 1.0x1.5 deg. elongated towards p.a. 145 deg.) 2007 12 30.775 S 3.3 TK 2.8R 2 70 2 DIJ Sint Annen 2007 12 30.47 S 3.8 YG 6.6R 10 &55 0 YOS Yokohama City, Kanagawa (Extremely diffuse. Uncertain how large the comet's coma extends due to the light pollution. I only managed to see the faint nebulous something around the position in the hazy sky.) 2007 12 30.44 S 4 :AA 2.5B 2 SEA Cowra, NSW (Very large and indistinct. Brightness estimate little more than guess.) 2007 12 29.90 S 3.5 HV 0.0E 1 72 2 BIV Pico-Veleta, Spain 2007 12 29.88 S 3.6 TJ 2.2R 5 >65 0 PER Cabo da Roca (Thin cirrus elsewhere in the sky; average transparency; comparisons with γ and τ Per, and ε Cas. Coma edges ill defined, tabulated diameter is a conservative estimate. With naked eye: Diam. about 65', DC=2/.) 2007 12 29.873 S 3.8:TK 0.0E 1 &60 1 COM Kongens Lyngby, Denmark 2007 12 29.767 S 3.4 TK 0.0E 1 &70 2 DIJ Sint Annen 2007 12 29.760 S 3.3 TK 0.0E 1 &85 2 BOU Sint Annen (Comet still easily visible with naked eye as a large diffuse object with slight condensation. In 7x50B, 17P appears more or less elliptical with very ill defined edges and rough dimensions of 60x90', elongated towards p.a. 145 deg.) 2007 12 28.81 S 3.5 HV 0.0E 1 60 3 BIV Pico-Veleta, Spain 2007 12 28.743 S 4.6 4.0R 10 63 2 LOO Genk 2007 12 28.12 S 3.4 TK 1.8R 3 &80 1 GRA Fjellhamar (With naked eye, faintly visible and a more challenging object than M44, but clearly seen using 3x18R. Moonlight.) 2007 12 27.88 S 3.5 TJ 2.2R 5 >65 0/ PER Cabo da Roca (Comparisons with γ and τ Per, and ε Cas. Coma edges ill defined, tabulated diameter is a conservative estimate. With naked eye: Diam. about 70', DC=2/.) 2007 12 26.81 S 3.5 TJ 2.2R 5 &68 0/ PER Cabo da Roca (Comparisons with γ and τ Per, and ε Cas. With naked eye: Diam. about 1.1 deg., DC=1.) 2007 12 26.78 S 3.2 TK 3.0R 4 70 2/ GON Quintanilla - La Magdalena, León (In 25x100B, coma 65x90' elongated towards the diffuse southern boundary; inner brighter region ext. 38' from cc, on p.a. 150 deg; broad tail-like feature extending 2.2 deg from center in p.a. 150 deg. Observation made before moonrise. Mountain location, very clear sky.) 2007 12 25.69 S 3.4 TK 1.8R 3 &75 1/ GRA Steinkjer (Using 3x18R and 7x50B, the comet was seen as an oval glow of low surface brightness, but somewhat higher than that of M33. Comet was also seen with naked eye despite a 16-days old Moon low in eastern sky [NEL about 5.5]. From lat. 64 deg. N.) 2007 12 21.05 S 3.5 TK 5.0R 8 &70 1 GRA Fjellhamar (Only faintly seen as a pale oval object; the instrument was from a f/4.0 camera lens set at 200-mm FL and 24-mm eyepiece. Comet not detected with naked eye due to a quite bright sky background in moonlight [NEL = 5.0].) 2007 12 19.22 S 3.4 TK 1.8R 3 70 1/ GRA Hågår Obs., Eina (Using naked eye, comet appeared slightly fainter than M44. With 3x18R, the comet showed an oval coma of fairly low surface brightness; this instrument was obtained from a camera lens [Canon EF 70-200mm f/4.0 L] set at slightly more than 70-mm and 24-mm ocular [Televue Panoptic]; this combination gave a sufficient amount of defocusing and a very wide field of over 20 degrees of good optical quality. Sky was dark as the observation was made a couple of hours after moonset.) 2007 12 18.68 S 3.8 YG 6.6R 10 58 1 YOS Yokohama City, Kanagawa (The sky was clear. I observed it after the half moon set. However, it was difficult to detect the comet with a 10x66 monocular without spending enough time in the dark location.) 2007 12 17.89 S 3.3 TK 3.0R 6 70 2 GRA Tryvann, Oslo (Surface brightness of comet markedly inferior to the central parts of M31 and M42. With naked eye, fairly easily seen and slightly brighter than the Double Cluster. First quarter Moon, NEL = 5.5.) 2007 12 17.66 S 3.8 YG 6.6R 10 &50 0 YOS Yokohama City, Kanagawa (The sky was hazy, so I could not determine the comet size exactly.) 2007 12 17.008 S 3.4 TK 0.0E 1 >60 1/ COM Roden 2007 12 16.722 S 3.3 TK 4.0R 10 30 2 LOO Genk 2007 12 16.13 S 3.3 TJ 2.2R 5 &70 0/ PER Cabo da Roca (Comparisons with γ and τ Per, and ε Cas. In 5x22 monocular coma edges are getting rather diffuse and ill defined. With naked eye: Diam. about 1.2 deg., DC=2.) 2007 12 15.94 S 3.4 TK 0.0E 1 &70 1 GIL Noordwijk aan Zee 2007 12 15.91 S 3.3 HV 0.0E 1 60 2 BIV Versailles 2007 12 15.902 S 3.3 TK 0.0E 1 &75 2 BOU Sint Annen 2007 12 15.899 S 3.5 TK 5.0B 7 60 2 DIJ Noorddijk 2007 12 15.875 S 3.3 TK 0.0E 1 >60 1/ COM Roden 2007 12 15.75 S 3.6 HI 5.0B 7 64 3 NOV Konchezero 2007 12 15.67 S 3.3 HI 0.7E 1 50 2 NOV Konchezero 2007 12 15.60 S 3.5 YG 6.6R 10 55 1 YOS Yokohama City, Kanagawa (It looks diffuse and faint due to the light pollution in the large city Yokohama, very different from the view in the mountain location. But anyway, it is still visible with naked eyes even in the large city.) 2007 12 15.16 S 3.3 TJ 2.2R 5 &65 0/ PER Cabo da Roca (Comparisons with γ, δ, and τ Per, and ε Cas. With naked eye: Diam. about 1.2 deg., DC=1.) 2007 12 15.060 S 3.4 TK 4.0R 10 33 2 LOO Genk 2007 12 14.12 S 3.2 TJ 2.2R 5 &64 1 PER Cabo da Roca (Comparisons with γ, δ, and τ Per, and ε Cas. With naked eye: Diam. about 75', DC=1/; several stars near the limit of naked eye visibility in and around coma.) 2007 12 13.927 S 3.3 TK 0.0E 1 &60 2 DIJ Noorddijk 2007 12 13.784 S 3.1 TK 0.0E 1 &75 3 BOU Sint Annen (In 7x50B, large elongated object with dimensions about 60x70'; hint of a very faint tail extending some 1.2 deg. in p.a. 160 deg. from very ill-defined cc.) 2007 12 13.63 S 3.5 YG 6.6R 10 52 1 YOS Yokohama City, Kanagawa 2007 12 13.05 M 3.1 YG 3.0R 6 60 2 GRA Eina (With naked eye, the comet appeared slightly larger and brighter than the Praesepe Cluster [M44]; it was easily visible due to a dark sky [NEL near 6.5].) 2007 12 13.04 S 3.2 TJ 2.2R 5 &58 2/ PER Cabo da Roca (Magn. 5.5 and 6.7 stars in coma; comparisons with γ, δ, and τ Per, δ and ε Cas. With naked eye: Diam. about 1.1 deg., DC=2/.) 2007 12 12.889 S 3.5:TK 5.0B 10 >60 2 COM Roden 2007 12 12.852 S 3.2 TK 0.0E 1 2 BOU Groningen 2007 12 12.732 S 3.2 TK 0.0E 1 60 2/ DIJ Kolhol 2007 12 12.52 S 3.2 AA 0.0E 1 60 SEA Cowra, NSW 2007 12 12.04 S 3.3 HV 0.0E 1 60 2 BIV Versailles 2007 12 11.90 S 3.2 TK 0.0E 1 &70 2 GIL Noordwijk aan Zee (In 10x50B and 20x60B coma about 75x60'.) 2007 12 11.89 S 3.1 TJ 2.2R 5 &60 2 PER Cabo da Roca (Two 6th mag stars in outer coma; comparisons with γ, δ, and τ Per, δ and ε Cas. With naked eye: Diam. about 1.1 deg., DC=2/; thin cirrus elsewhere in the sky.) 2007 12 11.868 S 3.5:TK 5.0B 10 >60 1/ COM Roden 2007 12 11.81 S 3.0 TK 0.0E 1 60 3 GON Sierra del Aramo, Asturias (In 25x100B, Coma 52x70', elongated towards the diffuse southern boundary; inner brighter region ext. 35' from cc, on p.a. 170 deg; broad tail-like feature extending 1.2 deg from center in p.a. 170 deg. Mountain location, very clear sky.) 2007 12 11.764 S 3.3 TK 4.0R 10 30 3 LOO Genk 2007 12 11.757 S 3.0 TK 0.0E 1 75 3/ BOU Lauwersoog (Still easily visible to naked eye as a large diffuse object with some condensation. Brighter than M31.) 2007 12 11.730 S 3.2 TK 0.0E 1 58 3/ DIJ Noorddijk 2007 12 11.70 S 3.2 YG 3.0R 6 60 2 GRA Råholt (Using 10x50B, the comet showed a coma with a tail-like central region, that was roughly oriented in N-S direction, and a U-shaped outer coma; the surface brightness of the central part was fainter than the bulge of M31 but brighter than M33, while the intensity of the outer coma was comparable to the latter galaxy. The comet was easily seen with naked eye and brighter than the combined glow of NGC 869 and NGC 884.) 2007 12 10.94 S 3.3 HV 0.0E 1 60 3 BIV Pico-Veleta, Spain 2007 12 10.93 S 3.1 TJ 2.2R 5 &55 2/ PER Cabo da Roca (Two 6th mag stars in outer coma; comparisons with γ, δ, and τ Per, δ and ε Cas. With naked eye: Diam. about 1.1 deg., DC=3; 3 mag 6.4-6.7 stars glimpsed around the comet.) 2007 12 10.82 S 3.3 HV 0.0E 1 60 3 BIV Pico-Veleta, Spain 2007 12 10.758 S 3.1 TK 0.0E 1 58 3 DIJ Sint Annen 2007 12 10.758 S 3.1 TK 0.0E 1 75 3 BOU Sint Annen 2007 12 10.47 S 3.4 AA 0.0E 1 70 SEA Cowra, NSW 2007 12 9.94 S 3.3 HV 0.0E 1 60 3 BIV Pico-Veleta, Spain 2007 12 9.94 S 3.1 TJ 2.2R 5 &52 3 PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas. With naked eye: Diam. about 1.1 deg., DC=2.) 2007 12 9.80 S 3.3 HV 0.0E 1 60 2 BIV Pico-Veleta, Spain Sint Annen 2007 12 9.751 S 3.1 TK 0.0E 1 70 3 DIJ Sint Annen 2007 12 9.751 S 3.1 TK 0.0E 1 75 3 BOU Sint Annen (In 15.6-cmL at 24x, coma about 55x75', still fairly sharply defined in the solar direction, but totally diffuse in the anti-solar direction. Very faint and diffuse tail, extending about 1.3 deg. from ill-defined cc. in p.a. 165 deg.) 2007 12 9.47 S 2.7 YG 0.0E 1 70 D2 YOS Kita-karuizawa, Gunma 2007 12 8.93 S 3.3 HV 0.0E 1 60 3 BIV Pico-Veleta, Spain 2007 12 8.85 S 3.1 YG 3.0R 6 &60 2 GRA Hågår Obs., Eina (With naked eye, the comet appeared larger and brighter than the visible part of M31 and somehat brighter than the Double Cluster; its angular extent [about 60'] was comparable to Pleiades. The comet was only briefly observed as the sky was about to clear when it was time to leave Hågår Observatory. This was, however, my first comet observation from this dark-sky location for over two years.) 2007 12 8.78 S 3.3 HV 0.0E 1 50 3 BIV Pico-Veleta, Spain 2007 12 8.78 S 3.3 TK 3.0O 4 50 2/ GON Grandota, Oviedo, Asturias (In 25x100B, coma 52x70', elongated towards the diffuse southern boundary; inner brighter region ext. 30' from cc, on p.a. 175 deg; broad tail-like feature extending 1.2 deg from center in p.a. 175 deg. Suburban location, clear sky.) 2007 12 8.64 S 2.7 YG 0.0E 1 67 D2 YOS Kita-karuizawa, Gunma (Amazingly bright in the mountain location! Still 2-mag object, so it has been keeping completely the same brightness since the outburst in late October. Much brighter, and much more attractive than Double Cluster h and χ Persei. It looks like a round planetary nebula with naked eyes. However, it also looks like a moderately condensed object (DC=4 or so) because so bright. So I do not feel it is a diffuse object. I want to estimate the brightness only with naked eyes because too bright. Because I am nearsighted, easy to estimate the total magnitude using Sidgwick method just taking off my glasses. It looks like a jellyfish, similar to the photos, through the 10x70 monocular. The view through the 0.40-m telescope is fantastic, the transparent envelope covers the whole scope view. The rim of the envelope is very clear with such a high magnification. The cometary nucleus is not visible through the 0.40-m telescope. Only the remnant of the outburst has been visible.) 2007 12 8.117 S 3.6:TK 5.0B 10 >60 1 COM Roden 2007 12 7.950 S 3.0 TK 0.0E 1 65 3/ DIJ Groningen 2007 12 7.949 S 3.1 TK 5.0B 7 69 3 DIJ Groningen (Coma clearly elongated towards p.a. 165 deg.) 2007 12 7.944 S 3.2 TK 0.0E 1 2 BOU Groningen (In 7x50B, coma about 50x65' elongated towards p.a. 165 deg.) 2007 12 7.60 S 3.4 YG 6.6R 10 54 1/ YOS Yokohama City, Kanagawa 2007 12 6.60 S 3.3 YG 6.6R 10 50 1/ YOS Yokohama City, Kanagawa 2007 12 5.987 S 3.0 TK 0.0E 1 &65 3 BOU Sint Annen (In 7x50B, coma about 50x70' elongated towards p.a. 170 deg.) 2007 12 5.924 S 3.0 TK 0.0E 1 55 3/ DIJ Groningen 2007 12 5.923 S 3.0 TK 5.0B 7 49 3/ DIJ Groningen 2007 12 5.60 S 2.8 YG 0.0E 1 60 4 YOS Yokohama City, Kanagawa 2007 12 5.60 S 3.1 YG 6.6R 10 63 2/ YOS Yokohama City, Kanagawa (Comet Holmes is a very huge nebulous object, clearly visible with naked eyes. Moderately condensed. It looks like M44 [Praesepe cluster].) 2007 12 5.08 S 3.2 TJ 2.2R 5 &54 1/ PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas. With naked eye: Diam. about 57', DC=2.) 2007 12 5.02 S 3.1 TK 3.0O 4 50 2/ GON Alto del Castro - Aralla, León (In 25x100B, coma 47x65' elongated towards the diffuse southern boundary; inner brighter region ext. 30' from cc, on p.a. 180 deg; broad tail-like feature extending 1.2 deg from center in p.a. 180 deg. Mountain location, very clear sky.) 2007 12 4.78 S 3.1 TK 3.0O 4 50 2/ GON Manzaneda, Oviedo, Asturias 2007 12 4.10 S 3.1 TJ 2.2R 5 &55 2 PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas. With naked eye: Diam. about 1.0 deg., DC=2/.) 2007 12 4.06 M 3.2 YG 3.0R 6 50 D2/ GRA Fjellhamar 2007 12 4.06 B 3.2 YG 0.7E 1 &50 2 GRA Fjellhamar (With naked eye the comet was seen somewhat brighter than the apparent diffuse glow from the Double Cluster (NGC 869/NGC 884); the magnitude estimate was obtained from the defocused view of the comet and the comparison stars [δ Per and ε Cas] as seen through dioptre +3 spectacles [the observer has a normal vision]. Using 6x30R and 10x50B, the coma was of moderate surface brightness and somewhat inferior to the central part of M31; it showed a brighter inner region that appeared diffuse and very elongated plus a parabola-shaped outer coma that was sharply defined on its sunward direction.) 2007 12 3.948 S 3.7 TK 5.0B 10 &60 1/ COM Roden (Comet large and elliptical, with naked eye better visible than M31; with 10x50B, short fuzzy tail to the south and coma boundary better defined in the solar direction.) 2007 12 3.93 S 3.3 TK 0.0E 1 &60 2 GIL Noordwijk aan Zee 2007 12 3.868 I 3.0 TK 0.0E 1 55 3/ DIJ Groningen 2007 12 3.867 S 3.0 TK 5.0B 7 49 3 DIJ Groningen 2007 12 3.864 S 3.0 TK 0.0E 1 3 BOU Groningen (With 7x50B, coma clearly elongated towards p.a. 170 deg. measuring some 45x60'. Very faint tail about 1.1 deg. in p.a. 170 deg.) 2007 12 3.60 S 3.3 YG 6.6R 10 52 1/ YOS Yokohama City, Kanagawa 2007 12 2.89 S 3.1 TJ 2.2R 5 &52 2 PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas; with naked eye: Diam. about 0.9 deg., DC=1.) 2007 12 2.884 I 3.0 TK 0.0E 1 50 3 DIJ Noorddijk 2007 12 2.883 S 2.9 TK 5.0B 7 47 3 DIJ Noorddijk 2007 12 2.80 S 3.4 TK 0.0E 1 &60 2 GIL Noordwijk aan Zee (In 10x50B coma about 64x40'.) 2007 12 2.799 S 3.2 TK 4.0R 10 22 4 LOO Genk 2007 12 2.60 S 3.0 YG 6.6R 10 55 2 YOS Yokohama City, Kanagawa (Comet Holmes looks very bright, easily visible, due to the clear sky. The central bright blob looks bar-like extending in north-south direction, surrounded by an extraordinary huge coma. Now Comet Holmes becomes so huge that it covers whole of Pleiades!) 2007 12 2.045 S 3.0 TK 0.0E 1 2/ BOU Groningen (In 7x50B, comet clearly elongated, measuring some 40x55' along a roughly N-S axis.) 2007 12 2.03 S 3.3 HV 0.0E 1 40 3 BIV Versailles 2007 12 1.88 S 3.1 TJ 2.2R 5 &50 2/ PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas; to the naked eye: Diam. about 1.0 deg., DC=1/; as in all my previous obs of this and other comets, diameters are measured along the so-called "latus rectum", i.e. the cord running through the pseudo nucleus and perpendicular to the coma's major axis; it is also appropriate to note that the coma seen visually is somewhat different from what current CCD images show; with 5x22 monocular, the coma appears as huge 50' nearly circular brightness plateau surrounded by a narrow annular outer-coma with diffuse edges; a broad dust tail has been obvious since the Moon stopped interfering a couple of nights ago, however the comet is in a rich Milky Way field, and star-alignments are numerous, so it is perhaps pointless to spend much time tracing such features visually when images can do it much better; the "leading" sharp edge of the coma, so prominent in current CCD images is not obvious with the instrument used for the m1 estimate; another fact worth mentioning is the distinct light-green color of the in-focus comet, as compared to the white extra-focal stellar images.) 2007 12 1.79 S 2.9 TK 3.0O 4 45 2 GON Grandota, Oviedo, Asturias (In 25x100B, coma 45x55', elongated towards the diffuse southern boundary; inner brighter region ext. 23' from cc, on p.a. 185 deg. Suburban location, clear sky.) 2007 12 1.76 S 3.5 HI 5.0B 7 41 2 NOV Konchezero 2007 12 1.75 S 3.3 HV 0.0E 1 40 2 BIV Versailles 2007 12 1.740 S 2.9 TK 5.0B 7 46 3 DIJ Groningen 2007 12 1.720 S 3.3 TK 5.0B 10 &50 2 COM Roden 2007 12 1.60 S 3.3 YG 6.6R 10 48 1 YOS Yokohama City, Kanagawa (Fine weather after 5 cloudy days. Comet Holmes is a very diffuse nebulouos object, but still clearly visible. The coma is elliptic.) 2007 11 30.82 S 3.1 TJ 2.2R 5 &48 2 PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas; to the naked eye: Diam. about 0.8 deg., DC=1.) 2007 11 30.78 S 2.9 TK 3.0O 4 45 2 GON Casorvida, Lena, Asturias (In 10x50B, coma 45x53' elongated towards the diffuse southern boundary; inner brighter region ext. 23' from cc, on p.a. 190 deg. Mountain location, very clear sky.) 2007 11 30.00 S 3.3 HV 0.0E 1 30 3 BIV Versailles 2007 11 29.90 S 3.3 TJ 2.2R 5 &48 2/ PER Cabo da Roca (Comparisons with γ, δ, and τ Per, δ and ε Cas; to the naked eye: Diam. 0.9 deg., DC=2.) 2007 11 29.837 S 3.0 TK 5.0B 7 41 3 DIJ Groningen 2007 11 29.814 S 2.9 TK 0.0E 1 &50 3 BOU Sint Annen (In 15.6-cmL at 29x the comet is clearly elongated some 45x60' in diameter. The coma boundary is rather well defined in the solar direction, but totally diffuse in the anti-solar direction. Brighter inner coma also clearly elongated, forming a narrowing spine towards p.a. 190 deg. This was the center of a very diffuse tail feature extending some 0.8 deg. towards p.a. 190 deg.) 2007 11 29.80 S 3.3 TK 0.0E 1 &60 2/ GIL Noordwijk aan Zee (In 10x50B coma about 60x40'.) 2007 11 29.736 S 3.2 TK 5.0B 10 &50 2/ COM Roden 2007 11 28.87 S 3.1 TJ 2.2R 5 &48 2/ PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas; to the naked eye: Diam. 0.8 deg, DC=2.) 2007 11 28.83 S 3.3 HV 0.0E 1 40 2 BIV Versailles 2007 11 28.015 S 3.2 TK 6.0B 15 35 2 DIJ Groningen 2007 11 27.927 S 3.0 TK 0.0E 1 2 BOU Groningen (Comet easily seen with naked eye as a large diffuse object, despite moonlight.) 2007 11 27.924 S 3.2:TK 5.0B 7 3 BOU Groningen (Coma clearly elongated measuring some 35x45', roughly in a N-S direction. Very clear sky with Moon obscured by cloud.) 2007 11 27.91 S 3.3 HV 0.0E 1 40 3 BIV Versailles 2007 11 27.83 S 3.1 TJ 2.2R 5 &48 2/ PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas; to the naked eye, the comet appears more condensed [DC=2] yet the outer coma edges [Diam. 0.6+-0.2 deg.] rather less sharply defined, as compared to the previous night [when the Moon was interfering].) 2007 11 27.81 S 2.9 TK 3.0O 4 40 3 GON Alto del Trichero - Soto y Amío, León (In 25x100B, coma 40x48', elongated towards the diffuse southern boundary; inner brighter region ext. 23' from cc, on p.a. 190 deg; broad tail-like feature extending 1.2 deg from center in p.a. 190 deg. Observation made after the end of astronomical twilight and before moonrise. Mountain location, very clear sky.) 2007 11 27.80 S 3.3 HV 0.0E 1 40 2 BIV Versailles 2007 11 27.67 M 3.0 YG 3.0R 6 40 2/ GRA Råholt (Comet appeared elongated, about 35x50' in size, major axis in N-S direction; its surface brightness was similar to the bulge of the Andromeda galaxy. Observed before moonrise in twilight [solar altitude -12 deg.] and with some interference from altostatus clouds. The comet was nevertheless easily seen with naked eye.) 2007 11 27.01 S 3.1 TJ 2.2R 5 &45 2 PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas; the comet appears as a diffuse [DC=1] patch about 0.8 deg in diameter to the naked eye. Moonlight.) 2007 11 26.93 S 3.3:TK 0.0E 1 >40 2/ GIL Noordwijk aan Zee (In 10x50B coma about 47x30'.) 2007 11 26.865 S 3.2 TK 6.0B 15 35 3 DIJ Groningen (Moonlight.) 2007 11 26.71 4.0 5.0B 7 30 1 BAR Milan 2007 11 26.188 S 3.4 TK 3.0B 8 19 4 LOO Genk 2007 11 26.00 S 3.0 TJ 2.2R 5 &45 2/ PER Cabo da Roca (Comparisons essentially with γ and δ Per; ε Per, δ and ε Cas were at very different angular distances from the Moon, and thus seen against a different sky background, nevertheless the m1 estimate does not change whether including or discarding comparisons against these stars; the comet is an easy naked eye object in spite of moonlight, appearing as a diffuse circular patch.) 2007 11 25.892 S 3.1 TK 5.0B 7 32 2/ DIJ Groningen (Moonlight. Also still visible with naked eye.) 2007 11 25.705 S 3.2 TK 5.0B 7 &35 2 BOU Groningen (Comet is becoming very diffuse, but easy to see in very transparant sky after showers. Moon low in east, obscured by clouds.) 2007 11 25.63 S 3.2 YG 6.6R 10 42 1/ YOS Yokohama City, Kanagawa (Comet Holmes is very diffuse, with little condensation. Due to the full moon near by the comet, it looks faint. But the large nebulous comet is clearly visible.) 2007 11 25.085 M 3.2 TK 6.0B 15 &30 2/ DIJ Groningen (Moonlight.) 2007 11 24.98 S 3.0 TJ 2.2R 5 39 2 PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas; the comet is an easy naked eye object in spite of moonlight, appearing as a completely diffuse [DC=0] circular patch; in 5x22 monocular an elongated inner-coma, superimposed on a larger circular coma, is rather less obvious than on the previous night.) 2007 11 24.61 S 3.1 YG 6.6R 10 40 1 YOS Yokohama City, Kanagawa 2007 11 24.04 S 3.0 YG 3.0R 6 35 2 GRA Fjellhamar (With 7x50B, clearly oval, about 30'x45' in size and with major axis directed in N-S direction; surface brightness of coma comparable to the nebula surrounding the θ Orionis complex. Comet clearly visible naked eye despite a full Moon.) 2007 11 23.95 S 2.9 TJ 2.2R 5 39 2 PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas; moonlight.) 2007 11 23.88 S 3.2 HV 0.0E 1 30 3 BIV Versailles 2007 11 23.853 M 3.1 TK 6.0B 15 &30 3 DIJ Groningen (Moonlight.) 2007 11 23.006 S 3.2 TK 5.0B 7 &30 3 BOU Groningen 2007 11 22.84 S 3.1 TK 3.0O 4 37 3 GON Oviedo, Asturias (Urban light pollution; moonlight.) 2007 11 22.51 S 3.1 YG 6.6R 10 39 2/ YOS Yokohama City, Kanagawa (Very cold, but the sky is very clear. So the diffuse comet is well visible despite the full moon. Fainter stars are visible with naked eyes than usual. And Comet Holmes is evidently visible with naked eyes, about 3rd magn. large diffuse nebulous object [smaller than 1 deg.].) 2007 11 22.21 S 3.3 TK 0.0E 1 >30 4 GIL Noordwijk aan Zee (In 10x50B coma about 40x30'.) 2007 11 22.188 S 3.4 TK 4.0R 10 21 4 LOO Genk 2007 11 21.976 M 3.2:TK 6.0B 15 30 3/ DIJ Groningen (Moonlight.) 2007 11 21.965 S 3.1 TK 5.0B 7 &30 3 BOU Groningen (Moonlight. Comet well visible near zenith. Elongated roughly in N-S direction with dimensions 30x40'.) 2007 11 21.88 S 3.2 HV 0.0E 1 35 3 BIV Versailles 2007 11 21.47 S 3.1 YG 6.6R 10 40 2 YOS Yokohama City, Kanagawa (The sky is very clear. But large Moon shines overhead, so the comet looks very faint. But the very large diffuse coma is visible.) 2007 11 21.18 S 2.9 TJ 2.2R 5 48 3 PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas; good transparency with scattered cumulus.) 2007 11 21.049 M 3.3 TK 6.0B 15 30 3 DIJ Groningen (Moonlight.) 2007 11 20.87 S 3.1 TK 3.0O 4 37 4 GON Oviedo, Asturias (In 25x100B, coma 37x48' [elongated towards the diffuse southern boundary]; inner brighter region ext. 23' from cc, on p.a. 195 deg; tail-like feature extending 1.2 deg from center in p.a. 195 deg. Urban light pollution; moonlight.) 2007 11 20.63 S 3.5 HI 5.0B 7 2 NOV Kondopoga 2007 11 20.60 S 3.0 YG 6.6R 10 39 3/ YOS Yokohama City, Kanagawa (Comet Holmes has passed α Persei. So it looks very bright and large even with moonlight thanks to the clear sky. The coma is elliptic, suggesting a broad tail towards south west.) 2007 11 19.90 S 2.9 TK 5.0B 7 35 3 GRA Tryvann, Oslo 2007 11 19.90 M 2.9 YG 0.7E 1 &30 4 GRA Tryvann, Oslo (With naked eye, easily seen and m1 estimate obtained when nearby α Per was placed just behind the top of a post. Using 7x50B, the coma appeared much larger and brighter than the bright part of M31, it showed a somewhat brighter oval central region of about 15x10'; the "mean" brightness of the coma was estimated as halfway between two nearby stars of mag. 4.96 and 5.56 [ref. TK] when these stars were defocused to 12', the tabulated m1 was derived from 5.26-5*log(35/12); α Per was located just within the visible part of the coma. This observation was made from about 500m elevation to escape a layer of low clouds. The sky was fairly dark [NEL = 5.5] despite the almost 10d old Moon.) 2007 11 19.821 S 2.9 TK 5.0B 7 &35 3 BOU Groningen 2007 11 19.819 M 3.1:TK 6.0B 15 3/ DIJ Groningen 2007 11 19.71 S 3.0 YG 6.6R 10 33 3 YOS Yokohama City, Kanagawa (It was rainy, but suddenly rain stopped and the sky became fine with few clouds. So I stopped going to bed and went out to observe the comet. The outer faint coma is overlapping on α Persei. But the central bright core is apart from the star. So it is not difficult to estimate the total magnitude with Sidgwick method. But the diameter estimate may be influenced by the star.) 2007 11 18.891 M 2.9 TK 6.0B 15 30 3/ DIJ Groningen 2007 11 18.819 S 3.0 TK 4.0R 10 20 4 LOO Genk 2007 11 18.808 M 2.9 TK 5.0B 7 30 3 BOU Groningen (Comet becoming more diffuse; elongated in roughly N-S direction, measuring some 30x40'. Southern edge very diffuse, just touching α Persei.) 2007 11 18.61 S 3.4 HI 5.0B 7 30 2 NOV Kondopoga 2007 11 18.55 S 3.1 YG 6.6R 10 34 3 YOS Yokohama City, Kanagawa (It was very cold, but the sky was very clear and the comet looked bright.) 2007 11 18.229 S 3.0 TK 3.0B 8 22 5 LOO Genk 2007 11 18.05 S 3.0 TJ 2.2R 5 37 3 PER Cabo da Roca (Comparisons with γ, δ and ε Per, δ and ε Cas.) 2007 11 17.92 S 3.1 HV 0.0E 1 30 4 BIV Versailles 2007 11 17.85 M 3.5:HI 5.0B 7 30 2/ NOV Kondopoga 2007 11 17.757 S 3.0 TK 3.0B 8 21 4 LOO Genk 2007 11 17.742 M 2.9 TK 6.0B 15 29 3/ DIJ Groningen 2007 11 17.55 S 3.0 YG 6.6R 10 37 3 YOS Yokohama City, Kanagawa (Finally, the rim of Comet Holmes's coma touched with α Per! Large diffuse object. Only a faint diffuse something is visible next to α Per with naked eyes.) 2007 11 17.23 S 3.1 HV 0.0E 1 30 5 BIV Versailles 2007 11 17.022 I 3.1 TK 0.0E 1 25 5 DIJ Groningen 2007 11 17.021 M 2.9 TK 5.0B 7 27 3/ DIJ Groningen 2007 11 17.01 S 2.9 TK 0.0E 1 &34 5 GIL Noordwijk aan Zee (Comet still seen separated from α Persei.) 2007 11 17.01 S 2.9 TK 3.0O 4 35 5 GON Alto del Castro - Aralla, León 2007 11 17.00 S 2.7 TK 0.0E 1 35 6 GON Alto del Castro - Aralla, León (In 20-cmT at 77x, Faint outer coma was not perceptible; inner disk 35' [elongated towards the diffuse southern boundary]; bright oval region ext. 17' from center, on p.a. 205 deg; tail-like feature extending 0.7 deg from center in p.a 200 deg; starlike cc: m2=12.5. Mountain location, very clear sky.) 2007 11 16.738 M 2.7 TK 5.0B 7 30 4 BOU Groningen 2007 11 16.72 3.6 7.0B 7 24 1 BAR Milan 2007 11 16.54 S 2.9 YG 6.6R 10 35 3/ YOS Yokohama City, Kanagawa (It is getting diffuse, more weakly condensed day by day. Also visible with naked eyes, but impossible to estimate the magnitude.) 2007 11 16.229 S 3.1 TK 3.0B 8 21 4 LOO Genk 2007 11 16.18 S 3.0 TK 0.0E 1 &34 5 GIL Noordwijk aan Zee (Some hindrance from α Persei.) 2007 11 15.99 S 2.9 TJ 2.2R 5 &30 2/ PER Cabo da Roca 2007 11 15.99 I 3.0 TJ 0.0E 1 &35 3/ PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, δ and ε Cas.) 2007 11 15.90 S 3.0 HV 0.0E 1 30 5 BIV Versailles 2007 11 15.805 I 2.7 TK 0.0E 1 30 8 DIJ Noorddijk 2007 11 15.804 M 2.5 TK 5.0B 7 32 6/ DIJ Noorddijk 2007 11 15.52 B 3.3 YG 0.0E 1 37 6 YOS Yokohama City, Kanagawa (It is still clearly visible with naked eyes. But now it is very hard to estimate the total magnitude because diffuse and faint.) 2007 11 15.51 S 3.0 YG 6.6R 10 33 4 YOS Yokohama City, Kanagawa (The coma looks elliptic and elongated.) 2007 11 15.22 S 2.8 TK 0.0E 1 &30 5 GIL Noordwijk aan Zee (Comet looks the same as yesterday, only a little bigger. Without glasses α Persei begins to interfere with observation.) 2007 11 15.13 M 3.0 TJ 2.2R 5 &30 3 PER Cabo da Roca 2007 11 15.13 I 2.9 TJ 0.0E 1 &32 4 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, δ and ε Cas.) 2007 11 15.033 S 2.6 TK 0.0E 1 &35 5/ BOU Sint Annen (Large, rather condensed object, easily visible despite proximity of α Per. In 15.6-cmL at 29x, the elongated coma measured approx. 25x30', with an inner brighter [also somewhat elongated] core 8' in diameter. The coma was shaped very much like a large yelly fish, rather sharply defined in the solar direction, but very diffuse in the anti-solar direction.) 2007 11 14.963 I 2.6 TK 0.0E 1 30 8 DIJ Groningen 2007 11 14.919 S 3.1 TK 3.0B 8 20 4 LOO Genk 2007 11 14.89 S 3.0 HV 0.0E 1 30 5 BIV Versailles 2007 11 14.80 3.1 5.0B 7 24 3 BAR Milan 2007 11 14.62 B 3.0 YG 0.0E 1 34 6/ YOS Yokohama City, Kanagawa 2007 11 14.62 S 2.8 YG 6.6R 10 31 4/ YOS Yokohama City, Kanagawa (Comet Holmes looks diffuse and faint through a monocular.) 2007 11 14.22 M 3.0 TJ 2.2R 5 &30 3/ PER Cabo da Roca 2007 11 14.22 I 2.9 TJ 0.0E 1 &30 4 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per.) 2007 11 14.17 S 2.7 TK 0.0E 1 &26 5 GIL Noordwijk aan Zee (Diameter coma in 10x50B and 20x60B about 28'. Coma more transparant than before, as there are several stars visible shining through the coma in 20x60B. 'Fountain' still visible.) 2007 11 14.07 S 3.0 HV 0.0E 1 25 5 BIV Versailles 2007 11 14.03 M 2.6 TK 0.0E 1 30 6 GON Alto del Castro - Aralla, León 2007 11 14.003 M 2.6 TK 5.0B 7 28 5 BOU Groningen (Coma somewhat oval shaped; edge more diffuse in the anti-solar direction.) 2007 11 13.94 M 3.0 TK 10.0B 25 31 5 0.6 200 GON Alto del Castro - Aralla, León (Faint outer coma was not perceptible; inner disk: 31' [elongated towards the diffuse southern boundary]; bright oval region ext. 11' from center, on p.a. 205 deg; tail-like radial feature extending 0.6 deg. from center in p.a 200 deg. In 20-cmT at 77x, starlike central condensation: m2=12.7. Mountain location, very clear sky.) 2007 11 13.938 M 2.4 TK 5.0B 7 27 6/ DIJ Groningen 2007 11 13.906 I 2.7 TK 0.0E 1 30 8 DIJ Groningen 2007 11 13.63 M 3.2 HI 5.0B 7 31 5 NOV Kondopoga 2007 11 13.62 B 2.9 YG 0.0E 1 30 6/ YOS Yokohama City, Kanagawa 2007 11 13.62 S 3.0 YG 6.6R 10 30 5/ YOS Yokohama City, Kanagawa (I observed the comet through a gap in the clouds. Maybe through thin clouds.) 2007 11 13.20 S 2.6 TK 0.0E 1 &26 5 GIL Noordwijk aan Zee 2007 11 13.04 M 2.7 YG 0.7E 1 30 5 GRA Fjellhamar (With 7x50B, an oval central area of about 15x7' was seen within the disc-like coma.) 2007 11 12.97 B 2.7 YG 0.7E 1 5/ SKI Hønefoss (With 7x50B, coma diameter 28'.) 2007 11 12.944 M 2.7 TK 5.0B 7 26 4/ BOU Groningen 2007 11 12.884 I 2.8 TK 0.0E 1 30 8 DIJ Noorddijk 2007 11 12.883 M 2.5 TK 5.0B 7 26 6 DIJ Noorddijk 2007 11 12.715 S 2.7 TK 3.0B 8 16 6 LOO Genk 2007 11 12.63 B 2.6 YG 0.0E 1 32 6/ YOS Yokohama City, Kanagawa 2007 11 12.63 S 2.8 YG 6.6R 10 30 5 YOS Yokohama City, Kanagawa (It was fine with no clouds. The sky was clear, and the comet was bright with naked eyes.) 2007 11 12.55 S 2.6 AA 0.0E 1 SEA Cowra, NSW (In 25.4-cmL at 71x, central "column" appeared very clear but edge of coma not quite as sharp as in binocular telescope. Coma had a somewhat "frosted" look.) 2007 11 12.21 S 2.5 TK 0.0E 1 &24 6 GIL Noordwijk aan Zee 2007 11 12.201 S 2.8 TK 3.0B 8 20 6 LOO Genk 2007 11 11.89 S 3.0 HV 0.0E 1 25 5 BIV Versailles 2007 11 11.79 S 2.6 TK 0.0E 1 &22 6 GIL Noordwijk aan Zee (In 20x60B, 8' bright spot in p.a. 215 deg. still visible. No tail seen.) 2007 11 11.787 S 2.8 TK 3.0B 8 19 6 LOO Genk 2007 11 11.78 B 3.0 TK 0.0E 1 JOH Gronau 2007 11 11.737 I 2.9 TK 0.0E 1 30 8 DIJ Groningen 2007 11 11.736 M 2.6 TK 5.0B 7 26 6 DIJ Groningen 2007 11 11.731 M 2.6 TK 5.0B 7 25 4/ BOU Groningen 2007 11 11.72 M 2.8 YG 0.7E 1 25 6 GRA Lillestrøm 2007 11 11.71 3.0 5.0B 7 24 2 BAR Milan 2007 11 11.69 B 2.7 YG 0.0E 1 33 7 YOS Yokohama City, Kanagawa (Comet Holmes looks a large cometary object with naked eyes.) 2007 11 11.69 S 2.6 YG 6.6R 10 30 5/ YOS Yokohama City, Kanagawa (It looks like a jellyfish in the city light through a monocular, a round disk with a sharp rim of the northern half and a central bright elongated core.) 2007 11 11.57 S 2.4 AA 0.0E 1 SEA Cowra, NSW (Through 25x100B, outer edge of coma closest to N horizon appeared very sharp and distinct, whereas the opposite side was quite indistinct. Column-like feature extended from central region of coma out to uppermost edge, appearing rather like a comet tail without definite head. It did not extend beyond the boundary of coma however. In 6x35B, comet seemed slightly elongated perpendicular to N horizon.) 2007 11 11.15 S 2.4 TJ 2.2R 5 &27 3/ PER Cabo da Roca 2007 11 11.15 B 2.9 TJ 2.2R 5 &27 3/ PER Cabo da Roca 2007 11 11.15 M 2.9 TJ 2.2R 5 &27 3/ PER Cabo da Roca 2007 11 11.15 I 2.8 TJ 0.0E 1 &25 4 PER Cabo da Roca 2007 11 11.15 GB 3.0 TJ 0.0E 1 &25 4 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, δ and ε Cas; as the coma gets larger, In-focus naked eye estimates become increasingly inappropriate, as it is difficult to have the eye respond to the total brightness of objects much larger than 20' or so even if using more averted vision than usual; however, the Out-Out method ,with a 3 diopters lens, is now perhaps even less adequate due to the comet's angular proximity to α Per; nevertheless, both naked eye estimates are still believed to be good to +-0.1-0.2 mag; with 5x22 monocular uncertainty in m1 is +-0.3 mag with In-Out method, as opposed to +-0.1 mag for Out-Out and Modified-Out methods.) 2007 11 10.87 M 2.6 YG 0.7E 1 25 6 GRA NOVA Observatory, Hvarnes (With 7x50B, other coma was glimpsed [diameter about 50'] and its surface brightness was much inferior to that of M33; tail [length 1.0 deg. in p.a. 200 deg.] was faint but certainly seen. Subsequent images showed both the tail and the outer diffuse coma. Dark sky [M33 visible to naked eye].) 2007 11 10.733 M 2.7 TK 5.0B 7 24 5 BOU Groningen 2007 11 10.55 S 2.8 AA 0.0E 1 30 SEA Cowra, NSW (Comet visible NE through layer of thin horizon cloud.) 2007 11 10.10 S 2.4 TJ 2.2R 5 &26 3/ PER Cabo da Roca 2007 11 10.10 B 2.8 TJ 2.2R 5 &26 3/ PER Cabo da Roca 2007 11 10.10 M 2.8 TJ 2.2R 5 &26 3/ PER Cabo da Roca 2007 11 10.10 I 2.8 TJ 0.0E 1 &22 4 PER Cabo da Roca 2007 11 10.10 GB 2.9 TJ 0.0E 1 &22 4 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, β Tri, δ and ε Cas; uncertainty in m1 with 5x22 monocular and VSS method is +-0.3 mag as opposed to +-0.1 mag for VBM and Modified-Out methods.) 2007 11 10.01 B 2.6 YG 0.7E 1 6 SKI Hønefoss (With 7x50B, coma diameter 25'.) 2007 11 10.00 B 2.4 TK 0.0E 1 25 7 GON Aralla de Luna, León 2007 11 9.98 M 2.6 YG 0.7E 1 25 6 GRA Svarstad (With 10x70B, tail [length 1.0 deg. in p.a. 210 deg.] was very faint; coma diameter 24'; outer coma was not seen with certainty. This and my subsequent 17P observation was made during a Norwegian astronomy conference.) 2007 11 9.95 M 3.0 TK 10.0B 25 55 D6 2.2 190 GON Alto del Castro - Aralla, León (Faint outer coma diameter: 55'; inner disk: 25' [elongated towards the diffuse southern boundary]; bright oval region ext. 7' from center, on p.a. 210 deg. The morphology of the tail is complex after the recent disconnection event. The old radial features are detached from the coma, the longest one extending 2.2 deg from center towards p.a 190 deg. In 10-cm Maksutov reflector at 65x, starlike cc: m2=12.5. Mountain location, very clear sky.) 2007 11 9.89 S 3.0 HV 0.0E 1 20 6 BIV Versailles 2007 11 9.812 M 2.6 TK 5.0B 7 19 8 DIJ Noorddijk 2007 11 9.810 I 2.8 TK 0.0E 1 20 8 DIJ Noorddijk 2007 11 9.72 3.0 5.0B 7 22 2 BAR Milan 2007 11 9.16 I 2.9 TJ 0.0E 1 &22 4 PER Cabo da Roca 2007 11 9.16 GB 2.9 TJ 0.0E 1 &22 4 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas; obs. after weak weather front passage.) 2007 11 9.016 B 2.8 TK 0.0E 1 5 BOU Groningen (Briefly very clear between showers.) 2007 11 9.00 S 2.9 HV 0.0E 1 20 5 BIV Versailles 2007 11 8.956 M 2.5 TK 5.0B 7 19 8/ DIJ Groningen 2007 11 8.913 I 2.7 TK 0.0E 1 21 8/ DIJ Noorddijk 2007 11 8.82 S 2.9 HV 0.0E 1 15 5 BIV Versailles 2007 11 8.70 I 2.9 YG 0.0E 1 24 7 YOS Yokohama City, Kanagawa 2007 11 8.70 S 2.5 YG 6.6R 10 24 5 YOS Yokohama City, Kanagawa (I observed the comet through a gap of clouds.) 2007 11 8.10 I 2.7 TJ 0.0E 1 &20 5 PER Cabo da Roca 2007 11 8.10 GB 2.7 TJ 0.0E 1 &20 5 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas.) 2007 11 8.04 M 2.5 YG 0.7E 1 20 6 GRA Fjellhamar (With 7x50B, the disc-like dust coma [diameter 21'] contained an oval and more diffuse cc; tail [length 0.5 deg. in p.a. 220 deg.] was barely visible; outer coma was not detected [M33 was seen as a faint glow].) 2007 11 7.997 M 2.9 TK 0.0E 1 20 7 LOO Itegem 2007 11 7.82 M 3.0 TK 10.0B 25 55 D6 1.7 210 GON Alto del Castro - Aralla, León (Outer coma surface brightness appears much fainter than four days ago; estimated diameter: 55'; inner disk: 21'; bright oval region ext. 6.5' from center, on p.a. 220 deg. Three main tail-like features were visible: in p.a 195 deg. [extending 1.7 deg. from center], p.a. 210 deg. [ext. 1.7 deg.] and 240 deg. [ext. 1.3 deg.]. In 20-cmT at 77x, starlike cc: m2=12.2. Mountain location, very clear sky.) 2007 11 7.80 B 2.4 TK 0.0E 1 25 7 GON Alto del Castro - Aralla, León 2007 11 7.792 I 2.6 TK 0.0E 1 9 DIJ Westerbork 2007 11 7.49 I 3.0 YG 0.0E 1 24 7/ YOS Yokohama City, Kanagawa (Naked eye impression: gazing at the comet directly, it looks faint. But looking around the comet area, I can notice something as bright as δ Per.) 2007 11 7.49 S 2.4 YG 6.6R 10 22 6 YOS Yokohama City, Kanagawa (It became very large now. It has kept the same brightness for two weeks!) 2007 11 7.20 I 2.5 TK 0.0E 1 &20 6 GIL Noordwijk aan Zee (With Swan Band filter comet looked definitely larger. With 10x50B, coma about 24'. In 20x60B parts of a gastail faintly visible. In 37-cm Newton with Swan Band filter two streamers of this tail visible.) 2007 11 7.08 I 2.7 TJ 0.0E 1 &20 5/ PER Cabo da Roca 2007 11 7.08 GB 2.7 TJ 0.0E 1 &20 5/ PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas.) 2007 11 6.94 S 2.9 HV 0.0E 1 15 6 BIV Versailles 2007 11 6.875 S 2.6 TK 5.0B 10 6 LOO Genk 2007 11 6.81 2.9 5.0B 7 15 3 BAR Milan 2007 11 6.795 I 2.6 TK 0.0E 1 9 DIJ Noorddijk 2007 11 6.794 M 2.5 TK 5.0B 7 16 8 DIJ Noorddijk (With 15x60B only a hint of outer coma visible.) 2007 11 6.77 I 2.5 TK 0.0E 1 &20 7 GIL Noordwijk aan Zee (In 10x50B, coma about 24'. In 20x60B, hints of an extended gascoma about twice this diameter; fountain still visible as well as the pseudonucleus.) 2007 11 6.75 B 2.8 TK 0.0E 1 JOH Gronau 2007 11 6.23 S 2.9 HV 0.0E 1 15 6 BIV Versailles 2007 11 6.20 S 2.8 HV 0.0E 1 15 6 BIV Versailles 2007 11 6.124 B 2.5 TK 0.0E 1 JOH Gronau 2007 11 6.07 I 2.6 TJ 0.0E 1 &25 6 PER Cabo da Roca 2007 11 6.07 GB 2.4 TJ 0.0E 1 &25 6 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas; dry conditions [rare at this location] allowing NEL=6.3 at 26 deg alt. and NEL=6.5 near zenith, in spite of being 30 Km from Lisbon's ever increasing light pollution; nevertheless, even tonight's nice sky is a far cry from what I enjoyed here less than 20 years ago!) 2007 11 6.057 I 2.6 TK 0.0E 1 9 DIJ Groningen 2007 11 6.056 M 2.4 TK 5.0B 7 17 9 DIJ Groningen (Outer coma approx. 24', lost some due to city lights.) 2007 11 6.014 M 2.6 TK 5.0B 7 16 D4 BOU Groningen (Comet rather sharply defined in the solar direction, but looked elongated and more diffuse in the antisolar direction. The coma diameter refers to the dust component. Only a hint of the outer coma with diameter about 25' was visible under suburban conditions.) 2007 11 6.010 B 2.7 TK 0.0E 1 5/ BOU Groningen 2007 11 5.65 M 2.5 HI 5.0B 7 19 5/ NOV Kondopoga 2007 11 5.14 S 2.7 HV 0.0E 1 15 6 BIV Versailles 2007 11 5.01 I 2.5 TJ 0.0E 1 6 PER Cabo da Roca 2007 11 5.01 GB 2.6 TJ 0.0E 1 6 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas.) 2007 11 4.92 S 2.8 HV 0.0E 1 15 6 BIV Versailles 2007 11 4.899 M 2.7 TK 0.0E 1 &20 7/ COM Kongens Lyngby, Denmark (Comet appeared in 10x50B as M13 in a small telescope.) 2007 11 4.64 M 2.7 HI 0.5E 1 8 NOV Kondopoga 2007 11 4.50 I 3.0 YG 0.0E 1 8 YOS Yokohama City, Kanagawa (The comet is coming to look faint in focus in a bad condition of a large city, because it is very large now.) 2007 11 4.50 S 2.5 YG 6.6R 10 15 5 YOS Yokohama City, Kanagawa 2007 11 4.01 GB 2.6 TJ 0.0E 1 6 PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas; similar m1 via in-focus naked eye estimate.) 2007 11 3.95 M 2.3 YG 0.7E 1 &30 6/ GRA Fjellhamar (In 7x50B, surface brightness of inner disc-like coma [size about 15'] appeared fainter than previously, but still considerably brighter than the bulge of M31; brightness of the outer diffuse coma [diameter about 40'] was comparable to M33.) 2007 11 3.92 B 2.1 YG 0.7E 1 6/ SKI Hønefoss (In 7x50B and 12.0-cmR at 25x, coma dimensions of 40' and 30' respectively refer to the outer halo; using 12.0-cmR at 111x, the size of the inner disc was 14'. Dark sky [NEL approx. 6.5].) 2007 11 3.91 M 2.6 HI 0.7E 1 7 NOV Kondopoga 2007 11 3.875 I 2.7 TK 0.0E 1 9 DIJ Noorddijk 2007 11 3.872 M 2.4 TK 5.0B 7 15 8/ DIJ Noorddijk (With 15x60B, outer coma 34'; some annular structure in dustcoma visible; onset of (gas)tail in p.a. 205 deg.) 2007 11 3.870 B 2.8 TK 5.0B 7 16 D3 BOU Groningen 2007 11 3.868 B 2.5 TK 0.0E 1 BOU Groningen (Observed during brief clear period. Coma diameter in 7x50B is basically the dust coma.) 2007 11 3.858 M 2.6 TK 0.0E 1 17 8 LOO Genk 2007 11 3.82 I 2.6 TK 0.0E 1 12 7 GIL Noordwijk aan Zee 2007 11 3.82 M 3.1 TK 20.3T 77 34 D6 0.9 210 GON Alto del Castro - Aralla, León (In 20-cmT at 77x, Faint outer coma diameter: 35'; inner disk: 16'; starlike cc: m2=11.0; bright oval region ext. 2.5' from center, on p.a. 220 deg. Inner coma disk's boundary from p.a. 140 to 290 deg is becoming diffuse compared to the distinct northern boundary. Three main tail-like radial features were visible: in p.a 170 deg. [extending 0.9 deg from center], p.a. 210 deg. [ext. 0.9 deg.] and 270 deg. [ext. 0.6 deg.]. Mountain location, very clear sky.) 2007 11 3.81 M 2.8 TK 10.0B 25 35 D6 GON Alto del Castro - Aralla, León 2007 11 3.78 I 2.3 TK 0.0E 1 30 7 GON Alto del Castro - Aralla, León 2007 11 3.48 B 2.1 YG 0.0E 1 20 8 YOS Gunma, Japan (With naked eyes, it looks cometary with strong condensation. It looks very bright in the dark location.) 2007 11 3.48 S 2.4 YG 7.0R 10 36 D0 YOS Kita-karuizawa, Gunma (Through a 10x70 monocular in the dark location, the total disk coma, not only the central core, looks very bright. The coma looks flat, completely round, so it really looks like a disk. The outer faint gas coma is also clearly visible. The gas coma extends larger than Moon, the diameter is 36 arcmin. The bright dust disk is also getting larger, the diameter is 15 arcmin now.) 2007 11 2.96 I 2.5 TJ 0.0E 1 7/ PER Cabo da Roca 2007 11 2.96 GB 2.5 TJ 0.0E 1 7/ PER Cabo da Roca (Comparisons with α, γ, δ and ε Per, α UMi, β Tri and δ Cas.) 2007 11 2.83 2.4 5.0B 7 12 3 BAR Milan 2007 11 2.09 M 2.5 YG 5.0B 7 35 6 GRA Losby, Lørenskog 2007 11 2.09 M 2.3 YG 0.7E 1 30 7 GRA Losby, Lørenskog (Using 7x50B, 'M' mag. is of the inner coma [size 12']. With 7.0-cmR at 20x, inner coma showed an elliptical cc of 4' in length and directed towards p.a. 220 deg.; glow from the outer coma was clearly fainter than M42 and brighter than M33.) 2007 11 1.96 I 2.4 TJ 0.0E 1 7 PER Cabo da Roca 2007 11 1.96 GB 2.4 TJ 0.0E 1 7 PER Cabo da Roca (Estimates based on comparisons with α, γ and δ Persei; similar m1 result if additionally using α UMi and δ Cas.) 2007 11 1.85 M 3.0 TK 20.3T 77 33 D6 0.6 210 GON Alto del Castro - Aralla, León (In 20-cmT at 77x: Faint outer coma diameter: 33' [without Swan band filter]; inner disk: 12'; starlike cc: m2=10.8; bright oval region ext. 2.3' from center, on p.a. 220 deg. Three main tail-like radial features were visible, extending 0.6 deg from center, in p.a 170, 210 and 270 deg. Mountain location, very clear sky.) 2007 11 1.83 M 2.8 TK 10.0B 25 30 D6/ GON Alto del Castro - Aralla, León 2007 11 1.79 I 2.3 TK 0.0E 1 25 7 GON Alto del Castro - Aralla, León 2007 11 1.69 M 2.7 HI 0.0E 1 8 NOV Kondopoga 2007 11 1.08 N 9.2 TK 15.2L 29 30 GRA Fjellhamar 2007 11 1.08 M 2.5 YG 5.0B 7 30 6/ GRA Fjellhamar 2007 11 1.08 M 2.3 YG 0.7E 1 25 7 GRA Fjellhamar (With 7x50B, magnitude estimate refers to the disc-like inner coma of 10'. Using 15.2-cmL, the outer diffuse coma was detected fairly easily; the 'N' estimate refers to an apparently stellar false nucleus; no tail was seen.) 2007 11 1.07 B 2.6 HV 0.0E 1 12 6 BIV Versailles 2007 11 1.04 B 2.1 YG 0.0E 1 7 SKI Hønefoss (With 12.0-cmR at 25x, the comet showed a muffins-like disc [size 10' as estimated using 111x] and an outer diffuse halo of 24' diameter; the disc and halo appeared brown-yellow and blue-green, respectively.) 2007 10 31.91 M 2.7 HI 5.0B 7 12 6 NOV Kondopoga 2007 10 31.88 GB 2.4 TJ 0.0E 1 8 PER Cabo da Roca 2007 10 31.88 I 2.4 TJ 0.0E 1 8 PER Cabo da Roca (Estimates based on comparisons with α, γ and δ Perseï.) 2007 10 31.81 M 2.8 TK 10.0B 25 28 D6/ GON Aralla, León (In 25x100B: Faint outer coma diameter: 28' [without Swan band filter]; inner disk: 9'; starlike cc: m2=9.5; broad fan ext. 2.3' from center, on p.a. 220 deg. Mountain location, very clear sky.) 2007 10 31.80 B 2.7 HV 0.0E 1 10 7 BIV Versailles 2007 10 31.78 I 2.3 TK 0.0E 1 25 7 GON Aralla, León 2007 10 31.73 2.4 5.0B 7 11 3 BAR Milan 2007 10 31.72 2.3 8.0B 20 10 1 BAR Milan 2007 10 31.47 I 2.7 YG 0.0E 1 8 YOS Yokohama City, Kanagawa 2007 10 31.47 S 2.4 YG 6.6R 10 9 6 YOS Yokohama City, Kanagawa (17P/Holmes became larger. Now it looks non-stellar with naked eyes even in the large city. Probably because it became large, it looks fainter with naked eyes.) 2007 10 31.10 N 9.0 TK 10.0R 25 21 D7 GRA Fjellhamar (Through 10.0-cmR at 25x, the most prominent feature was the planetary nebula-like disc [estimated diameter 9'], its surface brightness was considerably higher than the brightest parts of M31 and M42, its limb appeared somewhat diffuse in the sunward direction, but clearly more blurred on its anti-solar hemisphere. A stellar false nucleus was also well seen [its 'N' magnitude is tabulated] and located near the centre of the disc. A fan-shaped feature was radiating from the nucleus towards p.a. 220 deg., this fan was diffuse and of clearly higher surface brightness than the disc [its total magnitude was about 5.5, ref. TK], its length and angular span were 2'.5 and about 60 deg., respectively. A diffuse halo surrounded the disc, this outer coma was quite faint but fairly easily seen and of a markedly higher surface brightness than M33.) 2007 10 31.08 M 2.5 YG 5.0B 7 25 D7 GRA Fjellhamar (With 7x50B, the estimated 'M' magnitude corresponds to the nearly circular golden yellow disc of 10' in size.) 2007 10 31.07 B 2.3 YG 0.7E 1 21 7 GRA Fjellhamar (Using naked eye, 7x50B and 10.0-cmR at 25x, the given diameters refer to the diffuse outer coma. The comet was observed at altitudes up to 80 degrees and under a clear, transparent and moonlit sky. The naked eye limiting magnitude was about 5.5.) 2007 10 30.90 12.0R 111 8 SKI Hønefoss 2007 10 30.90 B 2.2 TK 0.7E 1 7/ SKI Hønefoss (The comet appeared slightly blue-green with naked eye. Using 12.0-cmR at 111x, the outermost halo appeared circular and showed a distinct and dark ring-shaped structure; the innermost point of light appeared brighter when compared to my previous observation.) 2007 10 30.81 B 2.4 TK 0.0E 1 JOH Gronau 2007 10 30.80 B 2.7 HV 0.0E 1 10 7 BIV Versailles 2007 10 30.77 S 2.5 TK 5.0B 10 12 7 GIL Noordwijk aan Zee (17P looked like an unresolved globular cluster with a dirty-yellow shade.) 2007 10 30.770 I 2.5 TK 0.0E 1 8 DIJ Sint Annen 2007 10 30.769 M 2.6 TK 5.0B 7 12 8 DIJ Sint Annen (Coma diameter is mainly that of the dustcomponent. With 15x60B the faint outer coma measured 24'. With 31-cmJ at 109x, the cc was estimated to be about magnitude 10.6 [ref. TA]. Edge of dustcoma sharp in the solar direction, and much more diffuse in the anti-solar direction.) 2007 10 30.767 B 2.4 TK 5.0B 7 &25 D4 BOU Sint Annen (With 7x50B, bright inner disk of ~10' with fairly distinct edge, surrounded by a faint, very diffuse outer halo of about 25'. Oct.30.80: In 31-cmJ at 72x and 109x, the bright inner disk was 9' in diameter; it was rather fuzzy in the anti-solar direction, but fairly sharp defined in the solar direction. At 109x the slightly fuzzy cc was estimated at about magn. 10.5 [ref. TA] and a rather broad, nearly circular fan of some 1.5-2' in diameter was seen in p.a 225 deg.) 2007 10 30.766 B 2.5 TK 0.0E 1 7/ BOU Sint Annen 2007 10 30.765 I 2.7 TK 0.0E 1 8/ COM Roden (Oct. 30.86 UT: In the 30.5-cmT at 117x and 150x : dustcoma more diffuse, broader fan and the brightness of the coma was varying: dustclouds? The dustcoma was more sharply defined to the south and more diffuse at the opposite side. At 117x the coma was estimated to be ~15'.) 2007 10 30.76 I 2.5 TK 0.0E 1 10 8 GIL Noordwijk aan Zee (17P brighter, bigger and less starlike than the day before. Probably due to Moon under the horizon.) 2007 10 30.746 M 2.2 TK 0.0E 1 8 LOO Genk 2007 10 30.743 S 2.4 TK 5.0B 10 9 8 LOO Genk 2007 10 30.64 M 2.6 HI 5.0B 7 11 6 NOV Kondopoga 2007 10 30.45 I 2.6 YG 0.0E 1 9 YOS Yokohama City, Kanagawa 2007 10 30.45 S 2.5 YG 6.6R 10 8 6 YOS Yokohama City, Kanagawa (Hazy sky, but the comet became larger.) 2007 10 30.16 S 2.7 HV 5.0B 7 10 7 BIV Versailles 2007 10 30.15 B 2.6 HV 0.0E 1 8 7 BIV Versailles 2007 10 30.142 S 2.5 TK 5.0B 10 8 6 LOO Genk (Round, with sharp boundaries. Yellow-green colour. Moonlight, having little effect on the comet.) 2007 10 31.14 B 2.7 HV 0.0E 1 8 7 BIV Versailles 2007 10 30.052 I 2.8 TK 0.0E 1 9 COM Roden (In 30.5T at 117x : bright stellar condensation of mag ~9.5 and broad jetlike fan; surrounded by almost circular coma; clearing up after a rainshower and the moon still in the clouds.) 2007 10 30.05 N 9.2 TA 20.3T 100 7 D3 GRA Fjellhamar (With 20.3-cmT at 100x, the comet showed a round disc with a somewhat diffuse edge [resembling a planetary nebula] that was centered around a stellar false nucleus [the 'N' magnitude refers to feature]; in addition there was a bright, diffuse and about 2' long tail-like fan that was apparently originating from the nucleus and directed towards p.a. 210 deg.; my photographs taken shortly afterwards [Oct. 30.06] also showed these features and in addition a faint and diffuse outer halo that appeared blue-green and 17' in size.) 2007 10 30.04 I 2.5 TJ 0.0E 1 7 PER Carnaxide (Near zenith; comparisons with α, γ and δ Perseï.) 2007 10 30.030 B 2.4 TK 0.0E 1 7/ BOU Thesinge (Comet clearly non-stellar to NE, but strongly condensed with slightly yellowish colour.) 2007 10 30.028 B 2.4 TK 5.0B 7 11 D3 BOU Thesinge (Amazing object in 7x50B. The comet looked like a large planetairy nebula with rather sharp edges surrounded by some faint nebulosity, probably the faint outer halo, largely blotted out by moonlight. The disc appeared of a white colour with a slightly greenish-yellow hue. The centre looked a little brighter, but in this instrument no further detail could be discerned. Comet at altitude of nearly 870!) 2007 10 30.01 B 2.6 HV 0.0E 1 6 7 BIV Versailles 2007 10 29.99 M 2.5 YG 5.0B 10 9 7 GRA Blindern, Oslo 2007 10 29.99 B 2.4 YG 0.7E 1 &10 7/ GRA Blindern, Oslo (Using 10x50B, the comet appeared much more extended than on Oct. 25.75; its brightness was much higher than the central part of M31. Clearly non-stellar with naked eye.) 2007 10 29.91 12.0R 111 7 SKI Hønefoss 2007 10 29.91 B 2.2 TK 0.7E 1 8 SKI Hønefoss (With 12.0-cmR at 111x, the comet showed a round halo with an apparently stellar point at the centre, plus a brighter region that was located asymmetrically with respect to the false nucleus; I also suspected a circular and slightly darker structure in the outer part of the halo.) 2007 10 29.89 I 2.6 TK 0.0E 1 9 GIL Noordwijk aan Zee (In 12.7-cmR at 39x, stellar nucleus visible, diameter dustcoma about 10', a fountain visible in p.a. 220 deg. plus hints of an extended gascoma. With a Swanband filter a coma of about 22' visible. The border of the dustcoma opposite fountain sharper than on the opposite side.) 2007 10 29.844 I 2.3 TK 0.0E 1 9 DIJ Groningen 2007 10 29.840 M 2.5 TK 5.0B 7 10 8 DIJ Groningen 2007 10 29.54 I 2.3 YG 0.0E 1 8/ YOS Fujishiro, Toride City, Ibaraki (Comet Holmes was bright, nearly equal to Algol. It looked almost stellar with naked eyes, but I could see the faint halo around the stellar nucleus. But the comet did not look disk-like object with naked eyes.) 2007 10 29.54 S 2.5 YG 6.6R 10 6.5 d6 YOS Fujishiro, Toride City, Ibaraki (Comet Holmes looked like an eye through a monocular, tiny central bright core and outer fainter round coma. It looked like a typical planetary nebula.) 2007 10 28.94 S 2.9 HV 5.0B 7 6 7 BIV Versailles 2007 10 28.92 B 2.8 HV 0.0E 1 5 7 BIV Versailles 2007 10 28.75 B 2.5 TK 0.7E 1 4 8/ DAH Les Olives, France (When compared to nearby stars of similar brightness, the comet was clearly seen as an extended source, and appeared as a very small object of high surface brightness, surrounded by a somewhat larger, diffuse envelope. Observed from the suburbs of Marseille.) 2007 10 28.75 2.5 5.0B 7 8 7 BAR Milan 2007 10 28.72 2.5 8.0B 20 6 2 BAR Milan 2007 10 28.46 I 2.4 YG 0.0E 1 9 YOS Yokohama City, Kanagawa (It still looks stellar with naked eyes.) 2007 10 28.46 S 2.4 YG 6.6R 10 5 6 YOS Yokohama City, Kanagawa (Comet 17P/Holmes looked flat last night, but it looks more cometary tonight. A tiny dense spot is visible at the center, surrounded with a circle coma. Now it is getting large, so the total magnitude seems to be getting slightly brighter.) 2007 10 28.07 I 2.5 TJ 0.0E 1 8 PER Carnaxide (Near zenith; comparisons with α, γ and δ Perseï.) 2007 10 27.92 B 2.5 TK 0.7E 1 1.5 8 DAH Marseille, France (The comet was clearly non-stellar, and appeared as a barely resolved object of high surface brightness, surrounded by a small diffuse envelope. For this and my following observation the comet and comparison stars were defocused using eyeglasses held at some distance from my eyes. Observed from central Marseille.) 2007 10 27.92 B 2.8 HV 0.0E 1 2 8 BIV Versailles 2007 10 27.91 B 2.8 HV 5.0B 7 4 7 BIV Versailles 2007 10 27.85 I 2.4 TK 0.0E 1 4 8/ GON Alto del Castro - Aralla, León 2007 10 27.81 M 2.8 TK 10.0B 25 11 7 GON Alto del Castro - Aralla, León (In 20-cm SCT at 77x: Faint outer coma diameter: 11' [without filter]; inner disk: 4'.0; starlike central condensation: m2=9.8; broad fan ext. 0.8' from center, on p.a. 220 deg. Outer coma is clearly enhanced with Swan band filter. Mountain location, very clear sky. Moonlight.) 2007 10 27.80 B 2.7 HV 0.0E 1 3 8 BIV Versailles 2007 10 27.74 I 2.5 YG 0.0E 1 9 YOS Yokohama City, Kanagawa (Comet 17P/Holmes still looks almost stellar with naked eyes. It is rather orange now. It got evidently brighter than on Oct. 24. I could find the comet itself before recognizing the Perseus constellation.) 2007 10 27.74 S 2.7 YG 6.6R 10 3.5 D2 YOS Yokohama City, Kanagawa (Using a 10x66 monocular, I immediately found a strange round ball-like object, like a planetary nebula or an out-of-focus star. Now it is not sharp at all, although it was completely stellar and strongly sharp on Oct. 24. The color is similar to Jupiter or Saturn. But the rim of the comet is much more blurred than those planets. So it does not look like a planet.) 2007 10 27.17 M 2.5 TK 5.0B 10 4 8 GON Ferrerinos - Oviedo 2007 10 27.16 I 2.4 TK 0.0E 1 4 8/ GON Ferrerinos - Oviedo (Moonlight.) 2007 10 27.07 I 2.5 TJ 0.0E 1 8 PER Carnaxide (Near zenith; comparisons with α, γ and δ Perseï.) 2007 10 26.83 I 2.6 TK 0.7E 1 1 9 DAH Marseille, France (The comet had a "planetary" appearance to the naked eye, showing little scintillation compared to nearby stars. The comet appeared as a barely resolved object, slightly less sharp than nearby stars of similar brightness. Observed from central Marseille.) 2007 10 26.58 S 2.4 AA 5.0B 10 3 SEA The Entrance, NSW (Visible naked eye despite full moonlight and very low elevation. Strong yellow colour in binoculars.) 2007 10 26.07 I 2.6 TJ 0.0E 1 8 PER Carnaxide (Near zenith; comparisons with α, γ and δ Perseï.) 2007 10 25.81 M 2.7 TK 5.0B 10 1.7 8 GON Alto del Trichero, León 2007 10 25.80 I 2.6 TK 0.0E 1 9 GON Alto del Trichero, León (Mountain location, very clear sky. Moonlight.) 2007 10 25.76 N 5.0 TK 7.0R 20 2.5 GRA Tryvann, Oslo (With 7.0-cmR, the coma showed a small but non-stellar cc [size about 15"] that was surrounded by a disc of almost uniform brightness. The yellow cc was slighty offset towards west and the 'N' magnitude refers to this feature.) 2007 10 25.75 B 2.4 YG 5.0B 7 0.7 SKI Sollihøgda 2007 10 25.75 B 2.4 YG 0.7E 1 9 SKI Sollihøgda (The comet was easily seen with naked eye and appeared yellowish in 7x50B. Observed at elevation 350 meters between Hønefoss and Oslo and above a layer of fog.) 2007 10 25.75 B 2.6 YG 5.0B 10 2 8 GRA Tryvann, Oslo 2007 10 25.75 I 2.6 YG 0.7E 1 9 GRA Tryvann, Oslo (In 10x50B the comet appeared considerably more extended than on Oct. 24.89. It now showed an easily visible disc.) 2007 10 25.08 I 2.4 TK 0.0E 1 9 GON Aralla de Luna, León (Mountain location, very clear sky. Moonlight.) 2007 10 24.93 I 2.7 TK 0.7E 1 9 DAH Marseille, France (The comet was an easy naked eye object as seen from central Marseille, despite moonlight and light pollution. The comet appeared stellar to the naked eye, with a yellow/orange colour. The non-stellar nature of this source was however revealed by the fact that it was seen to scintillate with a lower amplitude and longer typical time scale, compared to nearby stars of similar brightness.) 2007 10 24.91 B 2.8 HV 0.0E 1 1 9 BIV Versailles 2007 10 24.89 B 2.7 YG 5.0B 10 &0.5 9 GRA Tryvann, Oslo 2007 10 24.89 I 2.6 YG 0.7E 1 9 GRA Tryvann, Oslo (In 10x50B the comet appeared as a very small disc and yellowish in colour [slightly redder than nearby α Per]. With naked eye the object was easily seen as a stellar object despite a nearly full Moon and interference from cirrus clouds. Observed from about 500 meters elevation to escape a layer of fog/low clouds.) 2007 10 24.88 B 2.7 HV 5.0B 7 1 9 BIV Versailles 2007 10 24.87 I 2.9 YG 0.0E 1 9 CHE Ka-Dar, Barybino (Stellar appearance. Cloudy and hazy sky, fog.) 2007 10 24.83 B 2.8 HV 0.0E 1 1 9 BIV Versailles 2007 10 24.80 I 2.7 TK 0.0E 1 9 GON Alto del Trichero, León (Outburst. Coma diameter 0.5' in 25x100 B. Mountain location, very clear sky. Moonlight.) 2007 10 24.80 I 2.8 YG 0.0E 1 9 YOS Yokohama City, Kanagawa 2007 10 24.80 I 2.9 YG 6.6R 10 9 YOS Yokohama City, Kanagawa (17P/Holmes seems to have reached its maximum. It kept the same brightness during last two hours. The rapid brightening seems to have stopped.) 2007 10 24.72 I 2.8 YG 0.0E 1 9 YOS Yokohama City, Kanagawa 2007 10 24.71 I 2.9 YG 6.6R 10 9 YOS Yokohama City, Kanagawa (17P/Holmes got brighter furthermore! Perseus does not look "Perseus" familiar to us due to the bright stellar object now.) 2007 10 24.63 I 3.0 YG 0.0E 1 9 YOS Yokohama City, Kanagawa 2007 10 24.63 I 3.2 YG 6.6R 10 9 YOS Yokohama City, Kanagawa (17P/Holmes is brightening furthermore within two hours. It is about to be a 2-mag object soon!) 2007 10 24.55 I 3.5 YG 0.0E 1 9 YOS Yokohama City, Kanagawa 2007 10 24.55 I 3.7 YG 6.6R 10 9 YOS Yokohama City, Kanagawa (I confirmed the unbelievable super outburst of 17P/Holmes! It is visible with naked eyes in a large city!) 2007 10 6.67 S[14.1 TA 40.0L 257 !0.4 YOS Kita-karuizawa, Gunma 2007 10 5.74 S[14.1 HS 40.0L 257 !0.4 YOS Kita-karuizawa, Gunma (It was too late to observe, and not visible.) 2007 7 25.12 S 14.7 HN 20.3T 160 0.4 4 GON Alto del Castro - Aralla, León (Mountain location, very clear sky. Nearby field stars checked in DSS. Comparison stars taken from Henden photometry near WY Tri.)