Comet 2015V2 Johnson on Apr 15, 2017


Date & Time: Apr 15 2017, from 20:52 to 21:18 JST(+0900)
Composed 12 shots with 2min. exposed
Optical: VIXEN 20cm(7.9") VISAC with a conversion lens (f=1278mm, F6.4)
with Baader Planetarium 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(4800×3200)
Device Size...DX format (24×16mm)
Sensitivity...ISO6400, White Balance...Daylight


The comet 2015V2 Johnson in that day has positioned at 0.8 degrees north from the tau Her, a leg star of Hercules. You can recognize a highly-condensed coma and a dust tail stretched toward northwest with length of a bit longer than 10 arc minutes, I estimated the brightness of entire coma as about 8th magnitude. Currently, the comet hardly moves apparently. But it will start to move drastically to southwest from now on for the passage of perihelion in June 2017.
  View angle: 1.05×0.70°


Comet 2015V2 Johnson on Apr 28, 2017
Comet 2015V2 Johnson on Feb 3, 2017

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