Comet 2025K1 ATLAS on early mornning of Nov 22 & 24, 2025


Date & Time: Upper: Nov 21 2025, from 27:36 to 28:04 JST(+0900), 4min.×8shots
Lower: Nov 23 2025, from 26:34 to 27:21 JST(+0900), 3min.×16shots
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×2040)
Device Size...20×10mm
Sensitivity...ISO4000, White Balance...Daylight


This image captures the changes in comet 2025K1 ATLAS over a 48-hour period. In the central region of Ursa Major, it was moving at high speed-about 9 degrees in two days-heading NNW on the western side of the Big Dipper. Although the comet's coma had peaked and was around 10th magnitude, observations in mid-Nov 2025 revealed that the nucleus of the comet had split into several fragments. The image is blurred due to the comet's motion during the exposure, but the brightness around the nucleus is clearly uneven.
View angle: 0.70×0.35°


2025T1 ATLAS on Nov 23, 2025
2025K1 ATLAS on early morning of Nov 3, 2024

Copyright(c) 2025 by Naoyuki Kurita, All rights reserved.
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