* * * C/1999 T1 (McNaught-Hartley) * * *

lightcurves Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2001 5 25.991 S 12.2 HS 31.0J 72 2.2 1 DIJ Sint Annen 2001 5 25.988 S 12.2 HS 31.0J 72 2.0 0/ BOU Sint Annen 2001 5 24.976 S 12.0 GA 31.0J 72 2.1 1 BOU Sint Annen 2001 5 22.961 S 12.1 GA 31.0J 72 2.0 1 BOU Sint Annen 2001 5 20.981 S 12.0 GA 31.0J 72 2.3 0/ BOU Sint Annen 2001 5 18.971 S 12.0 GA 25.4J 58 2.5 1 BOU Sint Annen 2001 5 12.928 S 11.8 GA 31.0J 58 2.3 1 BOU Sint Annen 2001 5 11.934 S 11.8 GA 31.0J 72 2.4 1 BOU Sint Annen 2001 5 10.919 S 11.9 GA 31.0J 72 2.5 0/ BOU Sint Annen 2001 4 28.942 S 11.4 TJ 25.4J 72 2.5 1/ DIJ Sint Annen 2001 4 28.937 S 11.4 TJ 25.4J 72 2.2 1/ BOU Sint Annen (Observation slightly affected by 5d old moon low in W.) 2001 4 23.911 S 11.0 TJ 31.0J 58 2.1 2/ DIJ Sint Annen 2001 4 23.909 S 11.1 TJ 31.0J 58 2.7 2 BOU Sint Annen 2001 4 23.01 S 11.2 TJ 25.4L 76 2 2 GRA Hågår Obs., Eina 2001 4 21.911 S 11.0 TJ 31.0J 58 2.5 1/ DIJ Sint Annen 2001 4 21.910 S 11.1 TJ 31.0J 58 3.0 2 BOU Sint Annen 2001 4 19.887 S 11.0 TJ 25.4J 72 2.8 2 BOU Sint Annen 2001 4 18.934 S 11.2 TJ 30.5T 54 2.5 1 COM Roden 2001 4 18.913 S 10.7 TJ 25.4J 58 3.3 2 DIJ Sint Annen 2001 4 18.912 S 11.0 TJ 25.4J 58 3.0 2/ BOU Sint Annen 2001 4 13.95 S 10.9 TJ 25.4L 76 2.5 3 GRA Hågår Obs., Eina (Coma appeared elongated. This observation was somewhat affected by aurora [Bortle class 3-4]. There was a major auroral display earlier this evening.) 2001 4 13.878 S 10.8 TJ 25.4J 72 2/ DIJ Bedum 2001 4 13.877 S 10.8 TJ 25.4J 72 3.0 2 BOU Bedum (Close to star of magnitude 10.3) 2001 4 13.00 S 10.6 TJ 7.0R 7 24 3 3 GRA Hågår Obs., Eina (Comet was very faint but seen at correct location, its visibility was considerably inferior to M97. Dark sky (Bortle level 3).) 2001 4 12.890 S 11.0 TJ 30.5T 54 3 1/ COM Roden 2001 4 11.918 S 11.2:TJ 30.5T 54 & 3 2 COM Roden (Interference by aurora) 2001 4 11.860 S 10.6 TJ 25.4J 72 2.5 3 BOU Bedum (Comet just above a band of rather bright greenish-white aurora, but observation not affected.) 2001 4 2.09 M 10.4 TJ 25.4L 76 3.5 3 GRA Hågår Obs., Eina (A first quarter Moon low in western sky did not interfere too much [conditions were Bortle class 4].) 2001 3 31.112 S 10.3 TJ 30.5T 54 3.5 2/ COM Roden 2001 3 30.976 S 10.3 TJ 25.4J 47 3.1 3/ BOU Sint Annen 2001 3 26.956 S 10.0 TJ 25.4J 47 3.0 3/ BOU Sint Annen 2001 3 26.940 S 10.2 TJ 30.5T 54 4.5 3 COM Roden 2001 3 21.98 S 9.9 TJ 7.0R 24 3.5 3 GRA Hågår Obs., Eina 2001 3 21.067 S 9.7 TJ 25.4J 47 3.3 4 BOU Sint Annen 2001 3 21.06 S 10.0 TJ 25.4L 48 3.5 3/ GRA Hågår Obs., Eina 2001 3 21.03 S 9.8 TJ 7.0R 24 3.5 3 GRA Hågår Obs., Eina 2001 3 21.020 S 9.9 TJ 30.5T 54 5.5 3 COM Roden 2001 3 18.87 S 9.9 TJ 7.0R 24 3 2/ GRA Movatn, Oslo (Comet was very faint, its visibility was clearly inferior to Owl Nebula M97. This observation was made under a clear and fairly dark sky [Bortle scale 4-5, NE limit near 6.0].) 2001 3 18.03 S 10.0 TJ 20.3T 100 2.5 3 GRA Fjellhamar (The visibility of the comet was only slightly better than on Mar 17.95 despite a more powerful instrument. This was due to a brighter sky background from this location [Bortle class 6].) 2001 3 17.95 S 9.7:TJ 7.0R 24 3 GRA Tryvann, Oslo (Comet only barely visible under a Bortle class 5 sky.) 2001 3 16.984 S 9.6 TJ 25.4J 47 3.5 3/ BOU Sint Annen 2001 3 12.884 S 9.4 TJ 31.0J 58 3.8 4/ BOU Sint Annen 2001 3 6.198 S 9.2 TJ 30.5T 54 6 4 5m COM Roden 2001 3 6.193 M 9.1 TJ 15.6L 29 5.0 4 BOU Sint Annen 2001 3 3.083 S 9.0 TJ 30.5T 54 6 4/ & 8m COM Roden 2001 2 27.167 S 9.1 TJ 30.5T 54 6 4/ 5m COM Roden 2001 2 25.016 S 8.5 TJ 8.0B 15 5 4 BOU Sint Annen 2001 2 22.07 S 8.7 TJ 30.5T 54 4.5 5/ 10m 288 COM Roden 2001 2 22.02 S 8.8 TJ 5.0B 7 4 3 GRA Hågår Obs., Eina 2001 2 22.02 S 8.7 TJ 7.0R 24 4.5 3/ GRA Hågår Obs., Eina (Using 70-mm R, the coma appeared elongated in E-W direction. With 7x50 B, the comet was faint but easier to see than the Owl Nebula (M97). Favourable conditions [Bortle level 3-4 sky].) 2001 2 21.20 M 8.8 TJ 7.0R 24 4.5 3 GRA Hågår Obs., Eina (This observation was somewhat affected by twilight [Bortle class 4 sky].) 2001 2 20.019 S 8.1 TJ 8.0B 15 6 4 DIJ Sint Annen 2001 2 20.017 S 8.2 TJ 8.0B 15 5.4 3/ BOU Sint Annen 2001 2 18.12 S 8.5 TJ 7.0R 24 4.5 3 GRA Fjellhamar (Comet seen under moderate light pollution [Bortle class 6 sky].) 2001 2 16.16 S 8.5 TJ 8.0B 15 & 3 6 & 5m COM Roden 2001 2 16.04 B 8.3 HV 5.0B 7 4 3 GRA Hågår Obs., Eina 2001 2 16.04 S 8.2 HV 7.0R 24 4.5 3/ GRA Hågår Obs., Eina (Possible tail 0.2 deg. long in PA 280 deg. Comet visible without difficulty in binoculars. Favourable conditions [Bortle class 4 sky in direction of comet, class 3 around zenith].) 2001 2 13.11 S 8.2 TJ 7.0R 24 4.0 4 GRA Fjellhamar (Comet was faint but definitely seen under moderate light pollution [Bortle class 6 sky].) 2001 2 4.11 S 8.2 TJ 20.3T 100 3.5 3/ GRA Fjellhamar 2001 1 28.76 M 8.2 TJ 20.0L 45 3.0 5 MAT Wallaroo, SA (Short, faint tail in p.a. 280 deg.) 2001 1 25.212 S 8.1 TJ 15.6L 29 4.6 5 DIJ Sint Annen 2001 1 25.208 M 7.7 TJ 15.6L 29 4.6 5/ BOU Sint Annen 2001 1 8.236 S 8.2 TJ 10.0B 14 5 6 LOO Genk (In bright Moonlight and twilight.) 2000 12 31.23 7.4 8.0B 20 5 BAR Milan 2000 12 26.72 B 7.8 AA 10.0B 25 2 6 8m 270 SEA The Entrance, NSW ("Extreme" B Method used, placing both star and comet well out of focus.) 2000 12 26.240 M 7.6 TJ 15.6L 29 4.4 6 BOU Sint Annen 2000 12 23.252 M 7.7 TJ 15.6L 36 3.4 6 BOU Sint Annen 2000 12 22.253 M 7.7 TJ 15.6L 29 3.6 6 BOU Sint Annen 2000 12 19.74 M 8.0 TJ 10.0B 25 2.0 6 MAT Wallaroo, SA (Moonlight interference) 2000 12 17.71 M 7.5 AA 10.0B 25 SEA Cowra, NSW (Appearance unchanged using Swan Band filter. Moonlight.) 2000 12 8.75 M 8.2 TJ 10.0B 25 3.0 6/ MAT Wallaroo, SA 2000 12 3.74 M 8.1 TJ 10.0B 25 3.0 6/ MAT Wallaroo, SA (Comet displays a bright, almost stellar core with a 5' tail in p.a. 250 deg.) 2000 12 1.70 B 8.1 AA 10.0B 25 20m 265 SEA Cowra, NSW ("Extreme" B method used, placing comet and comparison stars well out of focus.) 2000 11 26.72 M 8.5 TJ 10.0B 25 3.0 6 MAT Wallaroo, SA 2000 11 17.74 M 8.6 TJ 10.0B 25 3.0 5/ MAT Wallaroo, SA (moonlight interference) 2000 11 3.72 M 8.6 AA 10.0B 25 3 6 SEA The Entrance, NSW 2000 10 27.75 M 8.9 TJ 10.0B 25 3.0 5/ MAT Wallaroo, SA 2000 10 8.78 M 9.5 TJ 20.0L 45 2.0 6 3m 220 MAT Wallaroo, SA 2000 10 7.73 S 9.4 AA 10.0B 25 SEA The Entrance, NSW 2000 10 2.79 M 9.6 TJ 20.0L 45 2.0 5/ 4m 230 MAT Wallaroo, SA (Comet is moderately condensed and now displays a short tail) 2000 10 2.71 S 9.6 AA 10.0B 25 2 SEA The Entrance, NSW 2000 8 10.81 S 11.0 TJ 20.0L 45 2.0 4/ MAT Wallaroo, SA 2000 8 1.81 S 10.9 TJ 20.0L 45 2.3 5 MAT Wallaroo, SA (Comet appears moderately condensed and is running slightly fainter than the ephemeris. Still a hopeful prospect) 2000 7 3.84 S 12.7 HS 20.0L 160 1.0 3 MAT Wallaroo, SA 2000 6 12.83 S 12.8 HS 20.0L 160 1.0 3 MAT Wallaroo, SA (Fainter than the predicted ephemeris by 0.7mag and not very condensed. May only reach 7th mag in Dec 2000) 2000 6 12.80 S 12.6 GA 25.4L 71 1.5 SEA Cowra, NSW