Comet 2019Y4 ATLAS on Apr 10, 2020


Date & Time: Apr 10 2020, from 19:46 to 20:46 JST(+0900)
Composed 20 shots with 3 minutes exposed
Optical: VIXEN 20cm(7.9") VISAC with conversion lens (f=1278mm, F6.4)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Nikon D810A
Location: Hitachi-oota city, Ibaraki pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(7360×4912)
Device Size...FX format(36×24mm)
Sensitivity...ISO4000, White Balance...Daylight


Click on image to enlarge

Comet C/2019Y4 ATLAS & NGC2403

Date & Time: Apr 10 2020, from 19:47 to 20:47 JST(+0900)
Composed 20 shots with 3 minutes exposed
Optical: BORG 60ED with conversion lens (f=245mm, F4.1)
with IDAS LPS-D1 Light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 6D (Remodeled)
Location: Hitachi-oota city, Ibaraki pref.

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


The comet C/2019Y4 ATLAS in that day has positioned at 4.7 degrees WNW of a bright galaxy of NGC2403 in eastern region of Camelopardalis. It was reported that the coma of the comet collapsed on Apr 6 and stopped its brightening. Images in this page show that the ionized composition around the coma has waned compared with that on Mar 20, while you can detect a 20 arc minutes-long dust tail in east direction. The brightness of coma can be estimated as about 9th magnitude, seems one or two magnitude darker than initial prediction. Unfortunately we have lost a rare opportunity to appreciate the comet ATLAS as a naked eye-comet in May 2020.
  1st image has been cropped with an equivalent focal length of 1600mm: View angle: 1.28×0.85°
  2nd image: View angle: 8.35×5.58°


2019Y4 ATLAS on Apr 25, 2020
2019Y4 ATLAS on Mar 20, 2020

Copyright(c) 2020 by Naoyuki Kurita, All rights reserved.
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