Comet 2021A1 Leonard on Nov 27-28, 2021


Date & Time: Left: Nov 27 2021, from 26:55 to 27:32 JST(+0900), 3min.×13shots
Right: Nov 28 2021, from 26:24 to 27:02 JST(+0900), 3min.×13shots
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(3060×4080)
Device Size...15×20mm
Sensitivity...ISO4000, White Balance...Daylight


The comet 2021A1 Leonard in the end of Nov 2021 has positioned on the border between Canes Venatici and Coma Berenices, approx. 7 degrees south of Cor Caroli. In spite of a moonlit night with the last quarter, I could observe an 8th magnitude coma and a nearly 1 degree-long dust tail clearly. This set of two images also shows you the change of dust tail during 24 hours. The comet Leonard will brighten up to 4th magnitude in the middle of Dec 2021.
  View angle: 0.52×0.70°


2021A1 Leonard on Dec 3-4, 2021
2019L3 ATLAS on Feb 25, 2022

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