Comet 2025R2 SWAN on Oct 17, 2025

Click on image to enlarge

Date & Time: Oct 17 2025, from 18:38 to 19:01 JST(+0900)
Composed 20 shots with 1 minute exposed
Optical: BORG 60ED with conversion lens (f=245mm, F4.1)
with IDAS NGS1-DRT Light-pollution suppression filter
Auto-guided with Kenko SKYMEMO S 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


On this day, comet 2025R2 SWAN was located low in the southwestern evening sky, within the Milky Way at the southern end of the constellation Serpens Cauda. A bluish coma of 6th magnitude was observed. The red nebulae visible on the left side of the image are the Eagle Nebula (M16) in Serpens at the top and the Omega Nebula (M17) in Sagittarius below.
Due to strong light pollution, the tail-which should have extended eastward-was barely detectable. The comet will now move rapidly eastward and is expected to fade rapidly as it enters Nov 2025.
This image is cropped to an effective focal length of 300 mm.
View angle: 4.6×6.8°


2025R2 SWAN on Nov 1, 2025
2025A6 Lemmon on Nov 1, 2025

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