Comet 2020R4 ATLAS on May 3, 2021


Date & Time: May 3 2021, from 20:10 to 20:39 JST(+0900)
Composed 8 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


The comet C/2020R4 ATLAS has moved about a quarter lap of the celectial sphere westward from my previous observation. In that day the comet could be obseved at the southern edge of Canes Venatici around the zenith of evening skies. The coma has a brightness of 9th magnitude; the greenish ionized composition looks noticeably. And you can detect a clear dust tail stretched in southeast direction; the length can be estimated as 12 arc minutes from the image.
  View angle: 0.70×0.70°


2020T2 Palomer on May 3, 2021
2020R4 ATLAS on early morning of Apr 11, 2021

Copyright(c) 2021 by Naoyuki Kurita, All rights reserved.
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