Comet 2021A1 Leonard on Dec 3-4, 2021


Date & Time: Left: Dec 3 2021, from 26:58 to 27:18 JST(+0900), 4min.×6shots
Right: Dec 4 2021, from 28:03 to 28:24 JST(+0900), 3min.×8shots
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


Click on image to enlarge

C/2021A1 Leonard with M3 & NGC5466 (Movement during 24-hours)

Date & Time: Dec 3 2021, from 27:04 to 27:32 JST(+0900), 4min.×8shots
Dec 4 2021, from 28:10 to 28:39 JST(+0900), 4min.×8shots
Optical: BORG 67FL with conversion lens (f=324mm, F4.8)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with VIXEN ATLUX Equatorial
Digital Camera: Canon EOS 6D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648)
Device Size...36×24mm, Sensitivity...ISO2500


In the dawn eastern skies, I could capture the comet 2021A1 Leonard moving eastward between Bootes and Canes Venatici. In that day the comet had a coma brightness of 6th magnitude and a three-degrees-long dust tail. The second image in this page shows you a composed one indicating the comet's movement for 24-hours (from right to left). You can detect two globular clusters of M3 in Canes Venatici and NGC5466 in Bootes in upper right and left hand sides, respectively. The comet Leonard will brighten up to 4th magnitude in the middle of Dec 2021, and close to the sun rapidly.
  1st image: View angle: 0.52×0.70°
  2nd image: View angle: 6.9×4.0°


2021A1 Leonard on early morning of Dec 11, 2021
2021A1 Leonard on Nov 27-28, 2021

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