Comet 3I ATLAS on early morning of Nov 29, 2025


Date & Time: Nov 28 2025, from 27:05 to 27:28 JST(+0900)
Composed 12 shots with 2 minutes exposed
Optical: VIXEN 20cm(7.9") VISAC with a conversion lens (f=1278mm, F6.4)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS R6
Location: Hiraiso, Hitachi-naka city, Ibaraki pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(2335×2335)
Device Size...15.2×15.2mm, Sensitivity...ISO3200


On this day, Interstellar comet 3I ATLAS was located low in the eastern sky at dawn, about 2.7 degrees west of η Virginis, and its coma was observed to be 10th magnitude, nearly the same as when it was photographed last week. No prominent tail was detected, giving it the appearance of a typical small comet. It passed perihelion at the end of Oct and is now heading back out of the Solar System. It will remain observable under favorable conditions from Japan for a while, but it is expected to fade rapidly.
View angle: 0.70×0.70°


3I ATLAS on early morning of Nov 22, 2025

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