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Updated on December 20, 2017 |
Go to Seiichi Yoshida's Diary of Comet Observations in 2018. |
2017 Dec. 18-19 (7 comets + 1 asteroid)I observed 7 comets and (3200) Phaethon visually on Dec. 18 and 19 in Mt. Hanadate, Ibaraki, Japan. The sky was fine and clear. C/2016 N6 ( PanSTARRS )
C/2016 R2 ( PanSTARRS )
C/2017 O1 ( ASASSN )
C/2017 T1 ( Heinze )
24P/Schaumasse
62P/Tsuchinshan 1
174P/(60558) Echeclus
(3200) Phaethon
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2017 Dec. 11 (2 comets + 1 asteroid)
I observed 2 comets and (3200) Phaethon visually on Dec. 11 in Kita-karuizawa, Gunma, Japan. It was fine well in the evening. But it was very cold due to the strong wind. It began to snow before the midnight. The sight was covered with snow in the morning. I could not observe C/2017 O1 because it was too close to a star in the evening. C/2016 R2 ( PanSTARRS )
174P/(60558) Echeclus
(3200) Phaethon
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2017 Nov. 24 (5 comets + 1 asteroid)
I observed 5 comets and (3200) Phaethon visually on Nov. 24 in Kita-karuizawa, Gunma, Japan. I had snow in the evening, but the weather became fine with few clouds at night. But thunder was shining frequently all night from the nearby snow clouds. I also tried to observe 145P. I found a very faint near-limit small object at the predicted position. But I checked the USNO-A2.0 catalog and found that it was a 15.5 mag background star. C/2016 R2 ( PanSTARRS )
C/2017 O1 ( ASASSN )
24P/Schaumasse
62P/Tsuchinshan 1
355P/LINEAR-NEAT
(3200) Phaethon
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2017 Oct. 26 (9 comets)
I observed 9 comet visually on Oct. 26 in Kita-karuizawa, Gunma, Japan. The weather was completely fine. The scenery was beautiful, the mountain covered with snow and the leaves turning to red. It was fine with no clouds in the evening, but there was moon light. After midnight clouds covered the sky, so I observed comets through gaps of clouds. I also tried to observe 217P. I found a stellar object around the position which was not recorded in the GSC chart. So I wondered if it was in outburst. But I checked the USNO-A2.0 and found a 14.7 mag background star at the position. C/2015 V1 ( PanSTARRS )
C/2016 M1 ( PanSTARRS )
C/2016 N4 ( MASTER )
C/2016 R2 ( PanSTARRS )
C/2017 O1 ( ASASSN )
24P/Schaumasse
29P/Schwassmann-Wachmann 1
62P/Tsuchinshan 1
71P/Clark
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2017 Sept. 25 (9 comets)
I observed 9 comet visually on Sept. 25 in Kita-karuizawa, Gunma, Japan. It was rainy for a short time in the evening, so the transparency was not good. C/2015 ER61 ( PanSTARRS )
C/2015 VL62 ( Lemmon-Yeung-PanSTARRS )
C/2016 N4 ( MASTER )
C/2016 R2 ( PanSTARRS )
C/2017 O1 ( ASASSN )
24P/Schaumasse
29P/Schwassmann-Wachmann 1
213P/Van Ness
217P/LINEAR
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2017 Aug. 12 (1 comet)
I observed 1 comet visually on Aug. 12 in Kita-karuizawa, Gunma, Japan. Trip with my friends for sightseeing around Karuizawa and star watching of Perseids meteor shower. Every day rainy. But we could have a small gap of clouds for an hour in the morning on Aug. 12. C/2015 ER61 ( PanSTARRS )
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2017 May 4 (5 comets)
I observed 5 comets visually on May 4 in Kita-karuizawa, Gunma, Japan. The weather was fine with no clouds. The Milky Way looked beautiful. I could see a bright shooting star of Aquarids. C/2015 ER61 ( PanSTARRS )
C/2015 V2 ( Johnson )
29P/Schwassmann-Wachmann 1
41P/Tuttle-Giacobini-Kresak
71P/Clark
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2017 Mar. 22 (4 comets)I observed 4 comets visually on Mar. 22 in Mt. Hanadate, Ibaraki, Japan. I was lucky because this is the night of remarkable rendezvous between 41P and M97, M108. C/2015 V2 ( Johnson )
41P/Tuttle-Giacobini-Kresak
45P/Honda-Mrkos-Pajdusakova
315P/LONEOS
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2017 Mar. 3 (6 comets)
I observed 6 comets visually on Mar. 3 in Mt. Hanadate, Ibaraki, Japan. New comet gb00099 was discovered by Borisov timely, I received the observations from Hidetaka Sato and the preliminary orbital elements from Hirohisa Sato, so I could observe the new comet. * New comet gb00099 became C/2017 E1 ( Borisov ) officially. The brightest comet C/2015 V2 was too close to a 4-mag star, so I could not estimate the magnitude, although it was easily visible. C/2015 ER61 ( PanSTARRS )
C/2017 E1 ( Borisov )
41P/Tuttle-Giacobini-Kresak
45P/Honda-Mrkos-Pajdusakova
73P/Schwassmann-Wachmann 3
315P/LONEOS
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2017 Feb. 6 (5 comets)
I observed 5 comets visually on Feb. 6 in Mt. Hanadate, Ibaraki, Japan. I wanted to observe 45P approaching to the earth before full moon. C/2015 ER61 ( PanSTARRS )
C/2015 V2 ( Johnson )
41P/Tuttle-Giacobini-Kresak
45P/Honda-Mrkos-Pajdusakova
73P/Schwassmann-Wachmann 3
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2017 Jan. 24 (9 comets)
I observed 9 comets visually on Jan. 24 in Mt. Hanadate, Ibaraki, Japan. Although the sky was covered with heavy clouds in day time, it became completely fine rapidly after the sunset, then it kept fine with no clouds all night. The moon with earthshine in the morning sky was very beautiful. C/2015 ER61 ( PanSTARRS )
C/2015 V2 ( Johnson )
2P/Encke
41P/Tuttle-Giacobini-Kresak
43P/Wolf-Harrington
73P/Schwassmann-Wachmann 3
93P/Lovas 1
144P/Kushida
315P/LONEOS
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Go to Seiichi Yoshida's Diary of Comet Observations in 2016. |