Comet 2025A6 Lemmon on Oct 9, 2025

Click on image to enlarge

Date & Time: Oct 9 2025, from 26:59 to 27:05 JST(+0900)
Composed 10 shots with 30 seconds exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS NGS1-DRT Light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS R6 (Remodeled)
Location: Hiraiso, Hitachi-naka city, Ibaraki pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648)
Device Size...35×24mm, Sensitivity...ISO800


This image shows comet 2025A6 Lemmon captured under the bright moonlight of a waning gibbous Moon (lunar age 18). The comet was located low in the northeastern sky, about 14 degrees south of β Ursae Majoris, one of the stars forming the Big Dipper. Based on comparison with nearby stars, the coma's brightness was estimated to be 6th magnitude. Although the moonlight obscured fine structural details, both the dust and ion tails can be seen extending northwestward in overlapping directions.
The image is cropped to an effective focal length of 700 mm.
View angle: 3.0×2.0°


2025A6 Lemmon on early morning og Oct 18, 2025
2025A6 Lemmon on Sep 26, 2025

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