Seiichi Yoshida's Diary of Comet Observations (2019)

Japanese version
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Updated on September 26, 2019

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Detailed observation data in ICQ format.

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* 2019 Sept. 25 (4 comets)

I observed 4 comets visually on Sept. 25 in Kita-karuizawa, Gunma, Japan.

C/2018 N2 ( ASASSN )

11.6 mag   Dia. 1.7'   DC 5   (40.0-cm reflector 75x)

Bright and well visible.

C/2018 W2 ( Africano )

9.2 mag   Dia. 6.5'   DC 3   (40.0-cm reflector 36x)

Diffuse but large.

68P/Klemola

13.3 mag   Dia. 1.0'   DC 3-4   (40.0-cm reflector 257x)

Faint and small.

260P/McNaught

11.7 mag   Dia. 1.3'   DC 4-5   (40.0-cm reflector 75x)

Moderately condensed.

* 2019 Sept. 9 (5 comets)

I observed 5 comets visually on Sept. 9 in Kita-karuizawa, Gunma, Japan.

Just after a typhoon has passed, and the weather was fine.

Two comets, C/2018 N2 and 260P, were very close, almost in the same field of view. I enjoyed the rendezvous.

C/2017 T2 ( PanSTARRS )

11.6 mag   Dia. 1.8'   DC 5   (40.0-cm reflector 75x)

Small, moderately condensed.

C/2018 N2 ( ASASSN )

11.9 mag   Dia. 1.5'   DC 7   (40.0-cm reflector 75x)

Very strongly condensed and sharp. Very close to 260P.

C/2018 W2 ( Africano )

9.6 mag   Dia. 6'   DC 2   (40.0-cm reflector 36x)

Bright and large. Weakly condensed and diffuse.

29P/Schwassmann-Wachmann 1

fainter than 14.0 mag   Dia. 1.0'   (40.0-cm reflector 257x)

Not visible, although a 15.7 mag star was visible.

260P/McNaught

11.6 mag   Dia. 1.7'   DC 6   Tail 3.2' (p.a. 225 deg)   (40.0-cm reflector 75x)

Looks nice with a tail. Very close to C/2018 N2.

* 2019 Aug. 16 (2 comets)

I observed C/2018 N2 and C/2018 W2 visually on Aug. 16 in Kita-karuizawa, Gunma, Japan.

Just after a typhoon has passed, however, there are many clouds. Hard to observe comets due to the strong moon light.

C/2018 N2 ( ASASSN )

12.3 mag   Dia. 0.7'   DC 4-5   (40.0-cm reflector 144x)

Small but strongly condensed.

C/2018 W2 ( Africano )

11.1 mag   Dia. 1.8'   DC 2-3   (40.0-cm reflector 144x)

Diffuse.

* 2019 May 2-3 (1 comet)

I observed 123P visually on May 2-3 in Kita-karuizawa, Gunma, Japan.

Very few visual comets in the Northern Hemisphere now.

123P/West-Hartley

May 2   13.7 mag   Dia. 1.1'   DC 3   (40.0-cm reflector 144x)

May 3   13.4 mag   Dia. 1.4'   DC 3   (40.0-cm reflector 144x)

Better visible on May 3 rathern than the previous day.

* 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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Go to Seiichi Yoshida's Diary of Comet Observations in 2018.

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