Seiichi Yoshida's Diary of Comet Observations (2021)
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Updated on December 20, 2021 |
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Go to Seiichi Yoshida's Diary of Comet Observations in 2022. |
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2021 Dec. 18 (3 comets) |
I observed 3 comets visually on Dec. 18 in Mt. Tsukuba, Ibaraki, Japan.
It was full moon.
C/2019 L3 ( ATLAS )
9.5 mag Dia. 2.2' DC 6-7 (40.0-cm reflector 75x)
Well condensed and easy to see.
4P/Faye
11.5 mag Dia. 0.5' DC 6 (40.0-cm reflector 257x)
Looks tiny because it located close to a star.
67P/Churyumov-Gerasimenko
8.9 mag Dia. 3.3' DC 4 (40.0-cm reflector 36x)
Large and easy to see.
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I observed 6 comets visually on Sept. 19 in Mt. Tsukuba, Ibaraki, Japan.
It was full moon, but the weather was fine just after a typhoon passed. But the sky was covered with thin clouds in the evening.
C/2019 L3 ( ATLAS )
11.0 mag Dia. 1.6' DC 7 (40.0-cm reflector 75x)
Very strongly condensed. Bright and easy to see.
C/2020 T2 ( Palomar )
10.4 mag Dia. 1.4' DC 3-4 (40.0-cm reflector 144x)
Hard to see due to the low sky condition.
On July 22, it was almost cloudy, but there is a gap of clouds only around the comet position.
P/2021 Q5 ( ATLAS )
13.5 mag Dia. 1.2' DC 1 (40.0-cm reflector 144x)
Diffuse.
4P/Faye
11.8 mag Dia. 1.8' DC 4-5 (40.0-cm reflector 75x)
Bright, but weakly condensed unexpectedly.
15P/Finlay
13.3 mag Dia. 0.9' DC 2 (40.0-cm reflector 144x)
Diffuse.
67P/Churyumov-Gerasimenko
11.3 mag Dia. 1.1' DC 7-8 (40.0-cm reflector 75x)
Very strongly and sharply condensed. Easy to see.
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Go to Seiichi Yoshida's Diary of Comet Observations in 2020. |