Comet 2020F3 NEOWISE on Jul 23, 2020

Click on image to enlarge

Date & Time: Jul 23 2020, 19:57 JST(+0900), 1min. exposed
Optical: AF zoom-Nikkor 80-200mm F2.8 (f=135mm, stop: F4.0)
with Kenko Starry-Night 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...ISO1600, White Balance...Daylight


The comet 2020F3 NEOWISE in that day positioned in evening northwest sky, about 13 degrees SSW of beta UMa (Merak) forming the Big Dipper. Due to unstable weather condition, I could capture only single shot of the comet during twilight; the comet was covered behind clouds and haze just after this shot. The coma brightness was estimated as 3.2th magnitude measured with this image, and same as an observation on Jul 19, the comet had a fan-like dust tail and a streak ion tail. The ion tail stretched to northeast direction has a length of about 10 degrees.
  The image has been cropped with an equivalent focal length of 200mm (View angle: 10.2×6.86°)


2020F3 NEOWISE on Jul 31, 2020
2020F3 NEOWISE on Jul 19, 2020

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