Comet 2025T1 ATLAS on Nov 23, 2025


Date & Time: Nov 23 2025, from 18:24 to 19:01 JST(+0900)
Composed 10 shots with 4 minutes exposed
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(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


On this day, comet 2025T1 ATLAS was located in the western evening sky, about 5 degrees southwest of Vega in the constellation Lyra. A greenish coma of 9th magnitude, with no prominent tail, was observed-considerably brighter than predicted. The comet is now near its maximum brightness and is expected to fade rapidly from here on.
View angle: 0.70×0.70°


3I ATLAS on early morning of Nov 22, 2025
2025K1 ATLAS on early mornning of Nov 22 & 24, 2025

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