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* * * * * C/2007 W1 (Boattini) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2008 11 22.50 S[14.6 TA 40.0L 257 !0.7 YOS Kita-karuizawa, Gunma (Finally, it became invisible.) 2008 11 1.50 S 13.8 TA 40.0L 144 1.0 2 YOS Kita-karuizawa, Gunma (I had imagined that the comet would have became too faint to see. But unexpectedly, it is still visible.) 2008 10 4.45 S 12.4 TJ 40.0L 144 1.5 2/ YOS Kita-karuizawa, Gunma (Very faint and diffuse. Hard to see directly, but not hard to find the comet with averted vision.) 2008 10 1.96 S 10.7 TK 20.3T 100 4 1 GON Alto del Castro - Aralla, León 2008 9 25.881 S 11.1 TA 31.0J 58 3.5 0/ BOU Lauwersoog 2008 9 25.877 S 10.6 TA 31.0J 58 3.5 0 DIJ Lauwersoog 2008 9 9.70 S 10.6 TJ 40.0L 75 4.4 2 YOS Kita-karuizawa, Gunma (Still bright, but already very diffuse. Slightly condensed at the center, but faint outer coma expands very large.) 2008 9 7.00 S 10.2 TK 20.3T 77 6 1 GON Alto del Trichero - Soto y Amío, León (Star of mag. 10.8 [Tycho-2] inside the coma.) 2008 9 3.950 S 9.8 TA 31.0J 58 5.8 0/ DIJ Sint Annen 2008 9 3.947 S 10.1 TA 31.0J 58 5 1 BOU Sint Annen 2008 9 1.92 S 10.8 TK 40.7L 58 5.5 3 BIV Valdrôme 2008 8 30.967 S 9.4 TK 31.0J 58 5.5 0/ DIJ Sint Annen 2008 8 30.962 S 9.9 TK 31.0J 58 5 1/ BOU Sint Annen 2008 8 29.08 S 10.1 TK 40.7L 58 6 2 BIV Valdrôme 2008 8 28.10 S 10.1 TK 40.7L 58 6 2 BIV Valdrôme 2008 8 28.04 S 9.4 TK 20.3T 77 6 3 GON Alto del Castro - Aralla, León (Stars of mag. 11.9 and 12.2 [GSC] inside the coma.) 2008 8 26.03 S 10.3 TK 40.7L 58 8 2 BIV Valdrôme 2008 8 24.85 S 9.2 TK 13.0L 33 7.6 3 NOV Konchezero 2008 8 23.87 S 9.3 TK 13.0L 33 10.6 3 NOV Konchezero 2008 8 14.88 M 8.4 TK 13.0L 33 9 4 NOV Konchezero 2008 8 13.11 S 8.0 TK 10.0B 25 10 4 GON Tábara, Zamora (Comet close to star of mag. 8.6 [Tycho-2].) 2008 8 13.002 S 8.0 TK 15.6L 24 5.5 3/ DIJ Garmerwolde 2008 8 12.999 S 8.0 TK 15.6L 24 6.5 3/ BOU Garmerwolde 2008 8 11.022 S 7.6 TK 15.6L 29 6 3/ DIJ Garmerwolde 2008 8 11.02 S 8.9 TK 25.6L 42 6 3 BIV Rambouillet 2008 8 11.015 S 7.9 TK 15.6L 29 7 2 BOU Garmerwolde 2008 8 11.01 S 8.7 TK 5.0B 7 9 5 BIV Rambouillet 2008 8 10.094 S 9.1 TK 25.0L 53 4 1 LOO Genk 2008 8 9.094 S 8.7 TK 25.0L 53 4 3 LOO Genk 2008 8 9.07 S 7.2 TK 5.0B 10 15 3 GON Alto del Castro - Aralla, León 2008 8 8.963 S 7.4 TK 8.0B 15 7.5 3 DIJ Sint Annen 2008 8 8.962 S 7.5 TK 8.0B 15 8 2/ BOU Sint Annen 2008 8 7.90 M 8.1 TK 13.0L 33 7 3 NOV Konchezero 2008 8 6.06 S 7.0 TK 5.0B 10 15 3 GON Alto del Castro - Aralla, León 2008 8 6.02 S 8.4 TK 25.6L 42 8 2 BIV Rambouillet 2008 8 6.01 S 8.1 HV 5.0B 7 12 3 BIV Rambouillet 2008 8 5.05 S 7.3 TK 5.0B 10 12 3 GON Alto del Castro - Aralla, León 2008 8 4.92 M 7.9 TK 13.0L 33 10 3 NOV Konchezero (Very diffuse, small condensation to center.) 2008 8 3.71 S 7.9 TJ 40.0L 36 7.5 3 YOS Kita-karuizawa, Gunma (Diffuse, but bright and easy to see.) 2008 8 2.90 M 7.4 TK 6.0R 35 9 4 NOV Lososinnoye 2008 8 2.08 S 7.2 TK 5.0B 10 8 5 GON Alto del Castro - Aralla, León 2008 7 31.91 M 7.1 TK 6.0R 70 12 4 NOV Lososinnoye 2008 7 30.023 S 7.2 TK 15.5L 50 7.5 3/ DIJ Garmerwolde 2008 7 29.010 S 7.1 TK 6.0B 15 8 3 DIJ Garmerwolde 2008 7 28.09 S 7.3 HV 5.0B 7 15 3 BIV Versailles 2008 7 15.11 S 5.8 TK 5.0B 10 15 5 GON Alto del Castro - Aralla, León 2008 7 15.069 S 6.4 TK 5.0B 10 10 3 LOO Genk 2008 7 9.78 S 5.7 AA 5.0B 10 12 4 SEA The Entrance, NSW (Faintly visible with naked eye.) 2008 7 8.12 S 5.3 TK 5.0B 10 15 5 GON Alto del Castro - Aralla, León (Astronomical twilight; altitude: 8 deg.) 2008 7 6.79 S 5.5 AA 5.0B 10 10 5 SEA The Entrance, NSW 2008 6 7.41 S 5.0 AA 3.5B 6 SEA Cowra, NSW 2008 5 31.38 S 5.3 AA 2.5B 2 SEA The Entrance, NSW 2008 5 30.34 S 5.2 AA 0.0E 1 SEA The Entrance, NSW 2008 5 29.39 S 5.2 TK 5.0B 7 17 MAT Castlemaine, Victoria 2008 5 29.36 S 5.0 AA 5.0B 10 SEA The Entrance, NSW (Observed in between drifting cloud.) 2008 5 28.39 S 5.2 TK 5.0B 7 18 MAT Castlemaine, Victoria 2008 5 27.41 S 5.2 AA 5.0B 10 SEA The Entrance, NSW 2008 5 27.39 S 5.2 TK 5.0B 7 18 MAT Castlemaine, Victoria 2008 5 25.35 S 5.4 AA 0.0E 1 20 SEA The Entrance, NSW 2008 5 24.39 S 5.3 TK 4.0B 8 18 4 MAT Castlemaine, Victoria (Sky transparency slightly better tonight with limiting magnitude about 6.0. Comet is faintly visible to the unaided eye using averted vision. In 25x100B, the coma is 20' wide with a hint of tail towards p.a. 100 deg.) 2008 5 24.35 S 5.6 AA 2.5B 2 20 SEA The Entrance, NSW (Faintly visible with naked eye.) 2008 5 23.37 S 5.4 TK 5.0B 7 17 MAT Castlemaine, Victoria 2008 5 21.37 S 5.8 TK 4.0B 8 15 MAT Castlemaine, Victoria 2008 5 11.93 S 6.3 TK 10.0B 25 25 3 GON Valdoré, León (Difficult estimate in 10x50B due to moonlight interference and low altitude [12 deg.].) 2008 5 8.46 S 6.7 TK 5.0B 7 17 MAT Castlemaine, Victoria 2008 5 8.45 S 6.4 AA 0.0E 1 SEA Cowra, NSW 2008 5 8.42 S 6.3 AA 3.5B 6 25 SEA Cowra, NSW (Comet fairly close to stars of similar brightness, but relatively confident of NE observation.) 2008 5 7.893 S 7.1 TK 8.0B 15 11 3 DIJ Lauwersoog 2008 5 7.89 S 7.7 TK 5.0B 7 15 2 BIV Rambouillet 2008 5 7.89 S 7.9 TK 25.6L 42 10 2 BIV Rambouillet 2008 5 7.887 S 7.2 TK 8.0B 15 11 1/ BOU Lauwersoog 2008 5 7.46 S 6.7 AA 3.5B 6 SEA Cowra, NSW (Glimpsed naked eye using averted vision.) 2008 5 5.44 S 6.9 TK 5.0B 7 16 MAT Castlemaine, Victoria 2008 5 4.893 S 7.4 TK 8.0B 15 10 1/ DIJ Lauwersoog 2008 5 4.890 S 7.1 TK 8.0B 15 12 2 BOU Lauwersoog 2008 5 4.42 S 7.0 AA 3.5B 6 SEA Cowra, NSW (Probably glimpsed with naked eye using averted vision.) 2008 5 3.52 S 7.8 TJ 40.0L 36 9 3 YOS Kita-karuizawa, Gunma (Very large! I guess it would have been larger and the estimation would have been brighter with a clear sky.) 2008 5 3.47 S 7.1 AA 3.0B 3 SEA Cowra, NSW 2008 5 3.42 S 7.2 TK 5.0B 7 14 MAT Castlemaine, Victoria 2008 5 2.94 S 6.9 TK 5.0B 10 20 3 GON Gallinero, Salas, Asturias 2008 4 29.38 S 8.0 TK 10.0B 25 12 2/ MAT Castlemaine, Victoria 2008 4 28.94 S 7.2 TK 5.0B 10 17 3 GON Puerto del Manzanal, León (Mountain location, very clear sky. Mag. 8.6 and 9.3 [TK] stars in coma.) 2008 4 28.42 S 7.0 AA 3.5B 6 10 SEA Cowra, NSW 2008 4 26.45 S 7.3 AA 5.0B 10 15 SEA The Entrance, NSW 2008 4 23.89 S 7.8 TK 10.0B 25 15 3 GON Alto del Castro - Aralla, León 2008 4 23.88 S 7.6 TK 5.0B 10 15 3 GON Alto del Castro - Aralla, León 2008 4 12.07 S 8.2 TK 10.0B 25 12 3 GON Sahagún, León (Estimate made after the moonset. Altitude: 17 deg.) 2008 4 6.54 S 9.1 AA 5.0B 10 12 SEA The Entrance, NSW 2008 4 6.11 S 8.6 TK 5.0B 10 12 3 GON Sierra del Aramo, Asturias 2008 4 6.10 S 8.8 TK 10.0B 25 10 3 GON Sierra del Aramo, Asturias 2008 4 5.47 S 9.2 AA 10.0B 25 12 SEA The Entrance, NSW (Possibly glimpsed in hand-held 10x50 binoculars.) 2008 4 3.98 S 8.9 TK 5.0B 10 10 3 GON Sierra del Aramo, Asturias 2008 4 3.97 S 9.1 TK 10.0B 25 8 3 GON Sierra del Aramo, Asturias 2008 4 3.43 S 9.9 GA 10.0B 25 SEA Cowra, NSW 2008 4 2.40 S 10.1 TK 10.0B 25 4 2 MAT Castlemaine, Victoria 2008 4 2.09 S 9.5 TK 10.0B 25 6 4 GON Aralla, León 2008 3 31.944 S 10.4 AU 31.0J 72 2.4 3/ DIJ Lauwersoog 2008 3 31.940 S 10.6 AU 31.0J 72 3 3 BOU Lauwersoog (Comet close to 2nd magn. γ Corvi.) 2008 3 31.44 S 10.4 TK 20.0L 67 4 2 MAT Castlemaine, Victoria (Observation affected by close proximity to γ Corvi.) 2008 3 30.90 S 9.7 TK 10.0B 25 6 4 GON Sierra del Aramo, Asturias 2008 3 29.40 S 10.3 GA 10.0B 25 SEA Cowra, NSW (Close to stars, but had the impression that it was more condensed than previously.) 2008 3 29.01 S 10.1 TK 20.3T 77 6 4 GON Sierra de Penouta - Boal, Asturias 2008 3 27.41 S 10.3 GA 10.0B 25 10 SEA Cowra, NSW (Under more favourable conditions than previous night, comet appeared much larger though very diffuse and of low surface brightness. A little enhanced with Swan Band filter.) 2008 3 26.42 S 11.2 GA 10.0B 25 3 SEA Cowra, NSW (Seen only briefly between cloudy periods.) 2008 3 6.08 S 12.7 HN 20.3T 133 2.2 4 GON Alto del Trichero - Soto y Amío, León (Mountain location, very clear sky. Comparison stars taken from Henden photometry - G020305.) 2008 3 5.70 S 13.8 AU 40.0L 257 0.6 4/ YOS Mt. Hanadate, Ibaraki (Already bright and easy to see.) 2008 3 2.54 S 12.8 GA 25.5L 71 1.5 2 SEA Cowra, NSW 2008 2 7.13 S 14.3 HN 20.3T 133 0.8 5 GON Aralla, León (Mountain location, very clear sky. Nearby field stars checked in DSS. Comparison stars taken from Henden photometry - G020305. Limiting star magnitude near comet : 15.3 [HN].)