* * * * * C/2004 B1 (LINEAR) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2006 6 5.07 S 12.8 TK 20.3T 100 1.0 3 GON Alto del Castro - Aralla, León 2006 5 25.96 S 12.8 TK 20.3T 100 0.7 4 GON Alto del Castro - Aralla, León 2006 5 23.957 S 12.8 GA 31.0J 109 1.2 4 BOU Sint Annen 2006 5 19.00 S 13.0 TK 20.3T 160 0.5 4 GON Alto del Castro - Aralla, León (Mountain location, very clear sky.) 2006 5 4.97 S 12.7 AC 41.0L 72 1.5 2/ RES Szamotuly-Galowo 2006 5 4.73 S 12.6 AU 40.0L 144 1.5 3/ YOS Gunma, Japan 2006 5 4.01 S 12.7 AC 41.0L 72 1.5 3 RES Szamotuly-Galowo 2006 5 3.73 S 12.5 AU 40.0L 144 1.2 3/ YOS Gunma, Japan 2006 5 2.74 S 12.2 AU 40.0L 144 1.0 4 YOS Gunma, Japan (I estimated smaller than Apr. 30, probably due to the nearby stars. On the other hand, it looked moderately condensed, probably because I saw only the central core.) 2006 4 30.74 S 12.0 TJ 40.0L 144 2.5 2/ YOS Gunma, Japan (It looked very large and diffuse. But using a 0.40-m telescope, the central core was clearly visible. It was impressive to see the comet floating among many stars in the Milky Way. It was diffuse anyway, so I see some estimated it much fainter or failed to see it without clear sky.) 2006 4 23.16 S 12.8 TK 20.3T 100 0.7 3 GON Bonella - Riello, León (Motion checked during a 45-min period.) 2006 3 31.77 S[10.7 TJ 40.0L 144 !0.8 YOS Ibaraki, Japan (Unfortunately, the ephemeris says the comet overlaps on a 11.8 mag star when the morning glow starts. So I tried to observe it earlier, when the comet was still very low. But due to the poor conditions, I could see only bright stars. Anyway, the comet was much fainter than 9 mag, originally expected. Katsumi Yoshimoto reported it as 12.6 mag by CCD, so it should be around 11.5-12 mag visually.) 2005 10 27.50 11.7 28.0T 133 2.0 3 MAT Stockport Observatory, SA 2005 10 22.47 S 12.7 GA 25.4L 71 1.6 2 SEA Cowra, NSW 2005 10 21.44 S 12.6 GA 25.4L 71 SEA Cowra, NSW 2005 10 11.72 12.0 28.0T 133 1.5 3 MAT Stockport Observatory, SA 2005 10 2.59 12.4 28.0T 133 1.5 2 MAT Wallaroo, SA 2005 9 30.72 12.2 28.0T 133 1.5 3 MAT Wallaroo, SA