* * * * * C/2013 N4 (Borisov) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2013 10 12.80 S 10.8 TJ 40.0L 144 1.3 3/ YOS Kita-karuizawa, Gunma (Hard to see due to the extremely low location. Brighter than expected. But maybe I overestimated.) 2013 8 18.17 S 8.8 TK 20.3T 77 6 2/ GON Alto del Castro - Aralla, León (Significantly brighter than expected. Diffuse wide coma. Beginning of astronomical twilight. Altitude 9°. Mountain location, very clear sky.) 2013 7 18.13 S 11.0 TK 20.3T 133 3 2 GON Alto del Castro - Aralla, León (Brighter than expected. Faint outer coma is difficult to observe with higher magnifications. Motion checked over a 30-min period. Nearby field stars checked in DSS and USNO A2.0. Some stars in coma, the brightest being mag 12.4 [GSC]. Beginning of astronomical twilight. Altitude: 13°. Mountain location, very clear sky.)