Comet 2025A6 Lemmon on Sep 21, 2025

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Date & Time: Sep 21 2025, from 26:20 to 27:02 JST(+0900)
Composed 8 shots with 6 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-D1 Light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 Equatorial & Lacerta M-GEN
CMOS Camera: ZWO ASI2600MC Pro (Cooled temp.: -10°C)
Location: Furudono town, Fukushima pref.

Camera Settings: Recording format...16bit FITS, converted to 16bit TIFF(6248×4176)
Device Size...23.5×15.7mm, Gain...100


On this day, Comet 2025A6 Lemmon was observed in the northeastern sky at dawn, in the southern part of Lynx, showing a green coma of about 8th magnitude. An ion tail extending about 1.5 degrees to the northwest was also visible. In October, Comet Lemmon is expected to move into the northwestern evening sky and brighten to 4th magnitude.
View angle: 2.5×1.7°


2025A6 Lemmon on Sep 26, 2025
Olbers on Aug 11, 2024

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