Comet 2017O1 ASASSN on Dec 22, 2017


Date & Time: Dec 22 2017, from 19:09 to 19:45 JST(+0900)
Composed 10 shots with 4min. exposed
Optical: VIXEN 20cm(7.9") VISAC with a conversion lens (f=1278mm, F6.4)
with IDAS LPS-D1 Light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(7360×4912)
Device Size...FX formet (36×24mm)
Sensitivity...ISO6400, White Balance...Daylight


The comet 2017O1 ASASSN in that day has positioned at Cepheus near the Polaris with the declination of 86°. I could observe the comet for all night because the comet was a cicumpolar star. Now the brightness of comet was about 10th magnitude, getting down gradually but observale for a while.
  The image has been cropped with an equivalent f=1600mm. (View angle: 1.28×0.85°)


62P Tsuchinshan1 on early morning of Dec 23, 2017
Comet 2017O1 ASASSN on Nov 11, 2017

Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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