Comet 2025T1 ATLAS on Dec 27, 2025


Date & Time: Dec 27 2025, from 17:56 to 18:20 JST(+0900)
Composed 12 shots with 2 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 low in the western sky at dusk, near the eastern edge of Aquila, with its 10th-magnitude coma observed 5 degrees ENE of θ Aquilae. From the Northern Hemisphere, it will become unobservable by January 2026, and in addition, it is expected to fade rapidly.
View angle: 0.70×0.70°


3I ATLAS on early morning of Nov 22, 2025
2025T1 ATLAS on Nov 23, 2025

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