Seiichi Yoshida's Diary of Comet Observations (2015)

Japanese version
Home page
Updated on May 5, 2015

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Detailed observation data in ICQ format.

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* 2015 May 1-2 (5 comets)

I observed 5 comets visually on May 1 and 2 in Kita-karuizawa, Gunma, Japan.

The weather was fine, but the sky was not so transparent due to the full moon. I also enjoyed the rendezvous of Mercury and Pleiades in the evening on May 1.

C/2014 Q2 ( Lovejoy )

May 1   7.5 mag   Dia. 7.5'   DC 7   (40.0-cm reflector 36x)

May 2   7.9 mag   Dia. 6.5'   DC 6-7   (40.0-cm reflector 36x)

Strongly condensed and easy to see.

C/2015 C2 ( SWAN )

May 1   about 11.0 mag   Dia. 1.0'   DC 2   (40.0-cm reflector 144x)

Hard to see due to the low sky.

C/2015 F3 ( SWAN )

May 1   12.7 mag   Dia. 1.4'   DC 2   (40.0-cm reflector 144x)

Tiny and diffuse. The full moon was about to set under the horizon, so the influence was less.

C/2015 F5 ( SWAN-Xingming )

May 1   about 11.6 mag   Dia. 1.5'   DC 1   (40.0-cm reflector 144x)

May 2   fainter than 12.0 mag   Dia. 1.0'   (40.0-cm reflector 144x)

Hard to see due to the full moon.

88P/Howell

May 2   10.2 mag   Dia. 1.2'   DC 2-3   (40.0-cm reflector 144x)

Hard to guide my telescope due to the low sky condition. Maybe the comet extends larger.

* 2015 Mar. 2 (1 comet)

I observed C/2014 Q2 visually on Mar. 2 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

5.4 mag   Dia. 7'   DC 3   (10x66 monocular)

The comet became faint, near limit in the city light pollution. This will be my final observation of C/2014 Q2 at this location.

* 2015 Feb. 15 (1 comet)

I observed C/2014 Q2 visually on Feb. 15 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

Strong wind.

C/2014 Q2 ( Lovejoy )

4.7 mag   Dia. 16'   DC 6   (10x66 monocular)

The comet looks bright and strongly condensed.

* 2015 Feb. 14 (1 comet)

I observed C/2014 Q2 visually on Feb. 14 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

5.0 mag   Dia. 15'   DC 5   (10x66 monocular)

It keeps bright much longer than expected.

* 2015 Feb. 10 (1 comet)

I observed C/2014 Q2 visually on Feb. 10 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.7 mag   Dia. 13'   DC 5   (10x66 monocular)

* 2015 Feb. 9 (1 comet)

I observed C/2014 Q2 visually on Feb. 9 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.4 mag   Dia. 15'   DC 5   (10x66 monocular)

The comet may have brightened.

* 2015 Feb. 8 (1 comet)

I observed C/2014 Q2 visually on Feb. 8 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

It had been rainy all day. But the sky became fine with no clouds very quickly in the evening.

C/2014 Q2 ( Lovejoy )

4.8 mag   Dia. 14'   DC 4-5   (10x66 monocular)

* 2015 Feb. 3 (1 comet)

I observed C/2014 Q2 visually on Feb. 3 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.7 mag   Dia. 12'   DC 4-5   (10x66 monocular)

It became small.

* 2015 Feb. 2 (1 comet)

I observed C/2014 Q2 visually on Feb. 2 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.8 mag   Dia. 14'   DC 4-5   (10x66 monocular)

* 2015 Feb. 1 (1 comet)

I observed C/2014 Q2 visually on Feb. 1 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.7 mag   Dia. 15'   DC 4   (10x66 monocular)

Hard to see in the city light pollution.

* 2015 Jan. 31 (1 comet)

I observed C/2014 Q2 visually on Jan. 31 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.7 mag   Dia. 16'   DC 5   (10x66 monocular)

Large moon exists, but the sky is very clear. However, the comet became much fainter than before.

* 2015 Jan. 28 (1 comet)

I observed C/2014 Q2 visually on Jan. 28 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.2 mag   Dia. 16'   DC 5-6   (10x66 monocular)

Near the half moon, but the sky is clear and the comet looks bright.

* 2015 Jan. 24 (1 comet)

I observed C/2014 Q2 visually on Jan. 24 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

The weather had been cloudy all day. But it suddenly became fine with no clouds at night.

C/2014 Q2 ( Lovejoy )

4.3 mag   Dia. 19'   DC 5   (10x66 monocular)

* 2015 Jan. 23 (1 comet)

I observed C/2014 Q2 visually on Jan. 23 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.5 mag   Dia. 17'   DC 6   (10x66 monocular)

The sky is very clear today, and the comet looks bright well.

* 2015 Jan. 20 (1 comet)

I observed C/2014 Q2 visually on Jan. 20 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.3 mag   Dia. 16'   DC 5   (10x66 monocular)

I felt the comet got faint, maybe due to the sky condition.

* 2015 Jan. 19 (1 comet)

I observed C/2014 Q2 visually on Jan. 19 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.0 mag   Dia. 18'   DC 6   (10x66 monocular)

* 2015 Jan. 18 (1 comet)

I observed C/2014 Q2 visually on Jan. 18 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.0 mag   Dia. 20'   DC 5-6   (10x66 monocular)

Through thin clouds, but it looks almost same as previous day.

* 2015 Jan. 17 (1 comet)

I observed C/2014 Q2 visually on Jan. 17 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

3.9 mag   Dia. 23'   DC 5-6   (10x66 monocular)

* 2015 Jan. 13 (1 comet)

I observed C/2014 Q2 visually on Jan. 13 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

3.8 mag   Dia. 22'   DC 6   (10x66 monocular)

The comet seems to have brightened furthermore.

* 2015 Jan. 12 (1 comet)

I observed C/2014 Q2 visually on Jan. 12 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.0 mag   Dia. 21'   DC 6   (10x66 monocular)

* 2015 Jan. 11 (1 comet)

I observed C/2014 Q2 visually on Jan. 11 beside Tsurumi River in Yokohama City, Kanagawa, Japan.

C/2014 Q2 ( Lovejoy )

4.3 mag   Dia. 20'   DC 5   (10x66 monocular)

Very bright and visible even in the strong city light pollution.

* 2015 Jan. 10 (1 comet)

I observed C/2014 Q2 visually on Jan. 10 in Toride City, Ibaraki, Japan.

C/2014 Q2 ( Lovejoy )

4.0 mag   Dia. 24'   DC 7   (10x70 monocular)

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Go to Seiichi Yoshida's Diary of Comet Observations in 2014.

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