Seiichi Yoshida's Diary of Comet Observations (2019)

Japanese version
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Updated on February 24, 2019

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Detailed observation data in ICQ format.

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* 2019 Feb. 23 (4 comets)

I observed 4 comets visually on Feb. 23 in Mt. Hanadate, Ibaraki, Japan.

Before the moon rise, but the sky condition was not so clear.

C/2018 Y1 ( Iwamoto )

8.3 mag   Dia. 11'   DC 4   (40.0-cm reflector 36x)

7.7 mag   Dia. 15'   DC 3-4   (10x70 monocular)

Bright and well visible.

38P/Stephan-Oterma

12.6 mag   Dia. 1.8'   DC 3   (40.0-cm reflector 144x)

It became faint, but still visible well.

46P/Wirtanen

10.2 mag   Dia. 4.3'   DC 1   (40.0-cm reflector 36x)

It became faint and small.

64P/Swift-Gehrels

12.4 mag   Dia. 2.3'   DC 1   (40.0-cm reflector 75x)

It became diffuse and faint.

* 2019 Jan. 6 (4 comets)

I observed 4 comets visually on Jan. 6 in Mt. Tsukuba, Ibaraki, Japan.

C/2018 Y1 ( Iwamoto )

11.6 mag   Dia. 2.4'   DC 1   (40.0-cm reflector 75x)

I could see Iwamoto's comet for the first time, since I missed his past two comets C/2013 E2 and C/2018 V1.

Diffuse, very weakly condensed.

38P/Stephan-Oterma

10.5 mag   Dia. 3'   DC 6-7   (40.0-cm reflector 75x)

Strongly condensed.

46P/Wirtanen

5.5 mag   Dia. 26'   DC 2   (10x70 monocular)

It became faint.

60P/Tsuchinshan 2

13.6 mag   Dia. 0.6'   DC 5   (40.0-cm reflector 144x)

It became brighter than expected. Well condensed.

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