* * * * * 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  9  9.17   S 10.8:TK  40.7L 135   2   2            BIV
2013  9  4.16   S 10.5:TK  40.7L 135  2.5  3            BIV
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°.)
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°.)