2017 Jan. 24 (9 comets)
I observed 9 comets visually on Jan. 24 in Mt. Hanadate, Ibaraki,
Although the sky was covered with heavy clouds in day time, it became
completely fine rapidly after the sunset, then it kept fine with no
clouds all night. The moon with earthshine in the morning sky was very
12.2 mag Dia. 1.1' DC 3-4 (40.0-cm reflector 144x)
Much fainter and harder to see than expected, probably
due to the low sky condition.
11.9 mag Dia. 1.7' DC 6-7 (40.0-cm reflector 75x)
Very strongly condensed and easy to see. Because it
located very near by a 11-mag star, maybe the outer coma
was not visible.
12.2 mag Dia. 1.7' DC 1-2 (40.0-cm reflector 144x)
13.8 mag Dia. 0.7' DC 3 (40.0-cm reflector 144x)
Already visible visually. Small.
13.6 mag Dia. 0.6' DC 2-3 (40.0-cm reflector 144x)
Unexpectedly still visible. Near by a globular cluster M68.
13.7 mag Dia. 0.6' DC 2 (40.0-cm reflector 257x)
Unexpectedly, already visible visually.
fainter than 13.5 mag Dia. 0.8' (40.0-cm reflector 257x)
13.9 mag Dia. 0.9' DC 2-3 (40.0-cm reflector 257x)
Unexpectedly still visible.
14.0 mag Dia. 0.3' DC 2 (40.0-cm reflector 257x)
Extremely hard to see.