Comet 2019Y4 ATLAS on Apr 25, 2020


Date & Time: Apr 25 2020, from 19:49 to 20:26 JST(+0900)
Composed 10 shots with 4 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 & Lacerta M-GEN
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


The comet C/2019Y4 ATLAS in that day has positioned around the southern region of Camelopardalis, observed in evening northwest sky. The nucleus collapsed in the beginning of April, the coma brightness has been down to 9th or 10th magnitude. Additionally the light concentration of coma seems considerably weak and the dust composition looks like an ellipse with a long axis of about 12 arc minutes.
  This image has been cropped with an equivalent focal length of 1600mm: View angle: 1.28×0.85°


2019U6 Lemmon on Jul 19, 2020
2019Y4 ATLAS on Apr 10, 2020

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