Comet 2025A6 Lemmon on Sep 26, 2025

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Date & Time: Sep 26 2025, from 27:16 to 27:54 JST(+0900)
Composed 8 shots with 5 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: Tamura city, 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 2025 A6 Lemmon was located in the southeastern corner of the constellation Lynx, with a coma of about 7th magnitude that could be clearly seen even through binoculars. Compared with an image taken five days earlier, the coma appears noticeably larger. In addition, the ion tail extending northwest has grown more complex in structure and can be traced beyond the field of view, reaching a length of over 2 degrees.
View angle: 2.5×1.7°


2025A6 Lemmon on Sep 21, 2025

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