* * * * * 3I/ATLAS * * * * *

Year Mn Day    MM  Mag Ref Scope Pwr coma  DC tail p.a. Obs  Site
2025 12  1.211  S 10.4 TK  15.5L  50  2.3  4            DIJ  Burlage
2025 12  1.18   S 10.0 TK  20.0L  42 & 3   3            SCH  Eerbeek
2025 11 22.30   S  9.7 TK  10.0B  20   3   3/           GOI  Araçatuba
2025 11 22.19   S 10.0 TK  20.0L  42 & 2   6            SCH  Eerbeek
2025 11 21.206  M  9.8 TA  25.4J  58  2.7  4            BOU  Westerwijtwerd
2025 11 21.184  S  9.6 TK  15.5L  50  3.4  4/           DIJ  Burlage
(Altitude comet 18°.)
2025 11 20.81   S  9.3 TJ  40.0L  36  3.5  5            YOS  Mt. Tsukuba, Ibaraki
(I could see an interstellar comet for the first time. Large and bright. I looks like an ordinary comet visually.)
2025 11 20.31   S  9.8 TK  22.0L  60   2   4            GOI  Araçatuba
2025 11 20.212  M  9.8 TA  25.4J  58  2.6  4            BOU  Westerwijtwerd
2025 11 20.19   S  9.6 TK  20.0L  42   4   5            SCH  Eerbeek
2025 11 19.31   S  9.7 TK  22.0L  60   2   4            GOI  Araçatuba
2025 11 18.24   S  9.3 TK  20.3T  77   4   5            GON  Cueto Rosales, León
2025 11 17.217  S  9.7 TK  15.5L  50   3   3/           DIJ  Burlage
(Also faintly visible in 15x80B.)
2025  9 23.40   M 12.1 AQ  40.0L 108  1.1  4            WYA  Walcha, NSW
(Altitude 14.7°. Enhances slightly in Swan Band filter. Very diffuse coma, moderately condensed.)
2025  9 16.40   M 14.5 AQ  40.0L 182  0.4  5/           WYA  Walcha, NSW
(Stellar central condensation visible in periods of good seeing. Altitude 25.4°.)
2025  9 15.39   M 14.7 AQ  40.0L 261  0.5  6            WYA  Walcha, NSW
(No enhancement in Swan Band filter. Visible at 182x. Central condensation m2 approximately 15.1 mag.)