Seiichi Yoshida's Diary of Comet Observations (2022)

Japanese version
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Updated on February 25, 2022

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Detailed observation data in ICQ format.

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* 2022 Feb. 22 (6 comets)

I observed 6 comets visually on Feb. 22 in Mt. Tsukuba, Ibaraki, Japan.

C/2017 K2 ( PanSTARRS )

about 11.7 mag   Dia. 1.6'   DC 4   (40.0-cm reflector 144x)

Overlapping over a 12.45 mag star.

C/2019 L3 ( ATLAS )

9.8 mag   Dia. 4.0'   DC 6-7   (40.0-cm reflector 36x)

Strongly condensed and easy to see.

C/2021 F1 ( Lemmon-PanSTARRS )

12.4 mag   Dia. 0.8'   DC 2   (40.0-cm reflector 144x)

Very weakly diffuse.

19P/Borrelly

9.2 mag   Dia. 4.5'   DC 4-5   (40.0-cm reflector 36x)

Bright and large.

67P/Churyumov-Gerasimenko

12.3 mag   Dia. 1.0'   DC 3   (40.0-cm reflector 144x)

It became very faint and small.

104P/Kowal 2

10.7 mag   Dia. 2.0'   DC 3   (40.0-cm reflector 144x)

Diffuse and harder to see than expected.

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