* * * * * C/2005 A1 (LINEAR) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2005 10 25.56 S 13.5 AU 40.0L 144 1.1 3 YOS Gunma, Japan 2005 10 24.41 S 13.6 AU 40.0L 144 0.9 2 YOS Gunma, Japan (I could observe it again after several cloudy nights. It is bright and clearly visible still, because locating overhead and the sky was clear. Diffuse, flat surface, and the contour was not clear, which are typical features of dust rich comets.) 2005 9 3.913 S 12.1 AU 31.0J 89 1.9 2/ DIJ Lauwersoog 2005 9 3.908 S 12.3 AU 31.0J 89 1.8 3 BOU Lauwersoog 2005 8 29.90 S 12.8 HS 40.7L 58 1.3 5 BIV Ablis 2005 8 28.96 S 12.5 TK 20.3T 133 1.0 3 GON Alto del Castro - Aralla, León 2005 8 15.11 S 12.1 TK 20.3T 100 1.5 3 GON Alto del Castro - Aralla, León 2005 8 6.76 S 12.5 AU 40.0L 144 1.2 3/ YOS Gunma, Japan 2005 8 6.06 S 12.3 TK 40.7L 58 1.2 4 BIV Valdrôme 2005 8 5.988 S 11.8 AU 31.0J 72 2.0 2/ BOU Sint Annen 2005 8 5.69 S 12.3 AU 40.0L 144 1.2 4 YOS Gunma, Japan (I finally could observe it in good condition. Faint and not easy to see.) 2005 8 5.03 S 12.2 TK 40.7L 58 1.7 4 0.05 225 BIV Valdrôme 2005 8 4.73 S 11.6 TJ 40.0L 144 1.8 1/ YOS Gunma, Japan (It seemed very large and diffused, but maybe I overestimated the size.) 2005 8 4.05 S 12.1 TK 40.7L 58 1.5 3 0.04 220 BIV Valdrôme 2005 8 2.999 S 11.4 AU 31.0J 89 2.4 3/ DIJ Sint Annen 2005 8 2.995 S 11.6 AU 31.0J 89 2.2 2/ BOU Sint Annen 2005 8 2.06 S 11.8 TK 20.3T 100 2 4 GON Alto del Castro - Aralla, León 2005 8 1.08 S 12.2 TK 40.7L 58 1.3 5 BIV Valdrôme 2005 7 31.00 S 12.1 TK 40.7L 58 1.3 5 BIV Valdrôme 2005 7 28.72 S 11.4:AU 40.0L 144 1.1 3 YOS Gunma, Japan (Extremely close to the half moon, and strongly interfered. Hard to see. The estimation must be very inaccurate.) 2005 7 19.12 S 11.3 TK 20.3T 133 2 4 GON Alto del Castro - Aralla, León 2005 7 16.10 S 11.2 TK 20.3T 100 3 4 GON Alto del Castro - Aralla, León (Mountain location, clear sky. Inner coma elongated in p.a. 210 deg.) 2005 7 15.055 S 11.3 AU 31.0J 58 1.9 2 DIJ Revest-du-Bion, France 2005 7 15.052 S 11.4 AU 31.0J 58 2.2 3 BOU Revest-du-Bion, France 2005 7 14.064 S 11.4 AU 31.0J 58 2.2 2/ BOU Revest-du-Bion, France 2005 7 14.063 S 10.9 AU 31.0J 58 2.0 1/ DIJ Revest-du-Bion, France 2005 7 11.060 S 11.3 AU 31.0J 58 2.5 2/ BOU Revest-du-Bion, France 2005 7 11.058 S 11.3 AU 31.0J 58 2.5 1/ DIJ Revest-du-Bion, France 2005 7 9.12 S 11.4 TK 20.3T 67 2.8 4 BIV Pico-Veleta, Spain 2005 7 9.050 S 11.2 AU 31.0J 58 2.4 2/ BOU Revest-du-Bion, France 2005 7 9.047 S 10.7 AU 31.0J 58 2.1 1 DIJ Revest-du-Bion, France 2005 7 8.12 S 11.2 TK 20.3T 67 3 4 BIV Pico-Veleta, Spain 2005 7 7.13 S 11.2 TK 20.3T 67 2 4 BIV Pico-Veleta, Spain 2005 7 6.12 S 11.5 TK 20.3T 67 3 5 BIV Pico-Veleta, Spain 2005 7 6.09 S 10.8 TK 20.3T 100 3 3 GON Alto del Trichero - Soto y Amío, León (Mountain location, very clear sky. Elongated inner coma.) 2005 7 6.063 S 11.1 AU 31.0J 58 2.0 2/ DIJ Revest-du-Bion, France 2005 7 6.058 S 11.0 AU 31.0J 58 2.5 2 BOU Revest-du-Bion, France (Some interference from nearby magn. 10.7 star.) 2005 7 3.10 S 10.9 TK 20.3T 77 3 3 GON Alto del Castro - Aralla, León (Mountain location, clear sky. Altitude: 14 deg.) 2005 7 2.10 S 11.1 TK 20.3T 100 2 3 GON Alto del Castro - Aralla, León (Mountain location, clear sky. Altitude: 14 deg. Moonlight interference. Coma enhanced through Swan band filter.) 2005 5 12.82 S 8.9 TK 10.0B 25 3 4 MAT Stockport Observatory, SA 2005 4 12.82 S 7.8:TK 10.0B 25 3 4 MAT Stockport Observatory, SA (At 5 degrees altitude.) 2005 4 11.40 S 8.4 AA 10.0B 25 SEA Cowra, NSW (Comet close to star and at very low elevation.) 2005 4 3.37 S 8.0 AA 10.0B 25 SEA The Entrance, NSW 2005 4 1.38 S 7.9 AA 10.0B 25 4 5 SEA The Entrance, NSW (Through Swan Band Filter, seemed slightly larger and less condensed, but little if any brighter.) 2005 3 11.41 M 8.5 AA 10.0B 25 SEA The Entrance, NSW (Light pollution from Sydney may have influenced the estimate somewhat, but I did feel that there had been some genuine fading since previous observations.) 2005 3 8.48 S 8.2 TK 10.0B 25 4 4 MAT Stockport Observatoty, SA (Coma slightly enhanced with a SWAN band filter.) 2005 3 7.45 S 8.0 AA 5.0B 10 SEA The Entrance, NSW 2005 3 6.47 S 8.0 AA 5.0B 10 SEA The Entrance, NSW 2005 3 5.58 S 8.1 TK 10.0B 25 4 4 0.33 200 MAT Penwortham, SA (Comet is clearly much brighter than anticipated and displays a faint ion tail. The comet is also an easy object through 7x50 binoculars in dark skies.) 2005 3 4.43 S 7.8 AA 8.0B 15 SEA Cowra, NSW 2005 3 3.50 S 7.9 AA 3.5B 6 SEA Cowra, NSW 2005 3 1.43 S 8.7 AA 10.0B 25 SEA Cowra, NSW (Comet close to bright star.) 2005 2 28.50 S 8.8 AA 10.0B 25 SEA The Entrance, NSW (Probably an underestimate as comet appeared faint in light sky [glow from Sydney and moon just risen].) 2005 2 14.52 S 9.2 AA 5.0B 10 8 SEA The Entrance, NSW (Appeared more condensed [DC = 5] in 25x100 binoculars, where it was very readily visible.) 2005 2 10.51 S 9.8 AA 10.0B 25 10 2 SEA Cowra, NSW (Comet more easily visible as a rather large and very diffuse object of low surface brightness. Little [if any] alteration when observed through Swan band filter.) 2005 2 7.51 S 10.2 AA 10.0B 25 SEA Cowra, NSW 2005 2 5.82 S 11.4 TJ 40.0L 144 1.2 3 YOS Ibaraki, Japan (Difficult object due to the weak condensation and low altitude. Not very small.) 2005 2 3.54 S 10.4 AA 10.0B 25 SEA The Entrance, NSW (Very marginal, but possibly enhanced with Swan Band filter.) 2005 1 17.25 S 11.6 TK 20.3T 100 2.5 3 GON Sierra del Aramo, Asturias (Mountain location, very clear sky. Elongated coma.)