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Updated on January 7, 2019 |
Go to Seiichi Yoshida's Diary of Comet Observations in 2019. |
2018 Dec. 31 (4 comets)
I observed 4 comets visually on Dec. 31 in Mt. Hanadate, Ibaraki, Japan. I started a new year 2019 in local time while I was observing comets. C/2016 N6 ( PanSTARRS )
38P/Stephan-Oterma
46P/Wirtanen
64P/Swift-Gehrels
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2018 Dec. 10-17 (1 comet)
I observed 46P/Wirtanen, passing near by Earth, in Hawaii. It looked very large with naked eyes thanks to the clear sky. 46P/Wirtanen
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2018 Nov. 30-Dec. 1 (8 comets + 1 asteroid)
I observed 8 comets and 1 asteroid visually on Nov. 30 and Dec. 1 in Kita-karuizawa, Gunma, Japan. The sky was often covered with thin clouds. C/2016 N6 ( PanSTARRS )
C/2018 L2 ( ATLAS )
21P/Giacobini-Zinner
29P/Schwassmann-Wachmann 1
38P/Stephan-Oterma
46P/Wirtanen
64P/Swift-Gehrels
78P/Gehrels 2
(944) Hidalgo
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2018 Nov. 3 (8 comets + 1 asteroid)
I observed 8 comets and 1 asteroid visually on Nov. 3 in Kita-karuizawa, Gunma, Japan. Mountains look beautiful with autumn leaves. It was cloudy in the evening, but it was fine from midnight to morning. C/2015 O1 ( PanSTARRS )
C/2016 N6 ( PanSTARRS )
C/2016 R2 ( PanSTARRS )
21P/Giacobini-Zinner
38P/Stephan-Oterma
46P/Wirtanen
60P/Tsuchinshan 2
64P/Swift-Gehrels
(944) Hidalgo
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2018 Oct. 6-7 (9 comets + 1 asteroid)
I observed 9 comets and 1 asteroid visually on Oct. 6 and 7 in Kita-karuizawa, Gunma, Japan. I really enjoyed many bright comets! On Oct. 6, a typhoon was passing through Japan, and the wind was very strong all night. On Oct. 7, it was fine with no wind. C/2016 N6 ( PanSTARRS )
C/2017 M4 ( ATLAS )
21P/Giacobini-Zinner
29P/Schwassmann-Wachmann 1
38P/Stephan-Oterma
46P/Wirtanen
48P/Johnson
64P/Swift-Gehrels
78P/Gehrels 2
(944) Hidalgo
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2018 Sept. 16-17 (8 comets + 1 asteroid)
I observed 8 comets and 1 asteroid visually on Sept. 16 and 17 in Kita-karuizawa, Gunma, Japan. It was cloudy or rainy in day time. But it became fine and I could see stars well at night. However, it was humid and the low sky was not clear. C/2017 M4 ( ATLAS )
21P/Giacobini-Zinner
37P/Forbes
38P/Stephan-Oterma
46P/Wirtanen
48P/Johnson
64P/Swift-Gehrels
78P/Gehrels 2
(944) Hidalgo
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2018 July 13 (8 comets)
I observed 8 comets visually on July 13 in Kita-karuizawa, Gunma, Japan. The sky was fine and very clear. I also tried to observe 66P, but I could not observe it because it overlapped on a 10-mag star. C/2015 O1 ( PanSTARRS )
C/2017 M4 ( ATLAS )
C/2017 S3 ( PanSTARRS )
C/2018 N1 ( NEOWISE )
21P/Giacobini-Zinner
29P/Schwassmann-Wachmann 1
37P/Forbes
48P/Johnson
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2018 May 3-4 (4 comets)
I observed 4 comets and 1 nova visually on May 3-4 in Kita-karuizawa, Gunma, Japan. In addition to 4 PanSTARRS's comets, I also observed a naked-eye nova discovered by Yuji Nakamura. The contrast of orange nova and a nearby blue star was beautiful. V392 Per: May 3.50: 8.4 mag (S. Yoshida, Gunma, Japan, 0.40-m f/4.5 reflector); May 4.49: 8.7 mag (S. Yoshida, Gunma, Japan, 0.40-m f/4.5 reflector); C/2015 O1 ( PanSTARRS )
C/2016 M1 ( PanSTARRS )
C/2016 N6 ( PanSTARRS )
C/2016 R2 ( PanSTARRS )
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2018 Mar. 12 (4 comets)
I observed 4 comets visually on Mar. 12 in Mt. Hanadate, Ibaraki, Japan. The weather was fine with no clouds in the evening, but the sky was dim. The sky was covered with clouds in the morning. But I could observe only C/2015 O1 through a gap of clouds in short time. C/2015 O1 ( PanSTARRS )
C/2016 N6 ( PanSTARRS )
C/2016 R2 ( PanSTARRS )
185P/Petriew
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2018 Jan. 6 (2 comets)I observed 2 comets visually on Jan. 6 in Mt. Hanadate, Ibaraki, Japan. I also tried to observe C/2017 O1 passing near by an open cluster NGC 188. But I could not see the comet due to a nearby double star of 14.5 mag stars. C/2016 R2 ( PanSTARRS )
C/2017 T1 ( Heinze )
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Go to Seiichi Yoshida's Diary of Comet Observations in 2017. |