Seiichi Yoshida's Diary of Comet Observations (2025)

Japanese version
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Updated on January 17, 2025

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Detailed observation data in ICQ format.

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* 2025 Jan. 16 (1 comet)

I observed C/2024 G3 ( ATLAS ) visually on Jan. 16 in Katahama coast, Numazu City, Shizuoka, Japan.

Finally I could see Comet C/2024 G3 ( ATLAS )! It looks cool, bright sharp comet in the evening dusk sky. I succeeded to take the photo with my smart phone.

There are large clouds in the west. I could see the comet only during three minutes, from 17:33 when the comet appeared from the cloud, to 17:36 when the comet set in the horizon. It was very lucky there was narrow clear sky between clouds and horizon.

C/2024 G3 ( ATLAS )

about -1.5 mag   DC 8   Tail 0.3 deg (p.a. 75 deg)   (10x66 monocular)

I estimated the brightness using Altair and gamma Aql. The comet was -1.5 mag, the second brightest comet in my life next to C/2006 P1 ( McNaught ). However, in my impression, Comet Tsuchinshan-ATLAS last year was much greater.

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