Comet 2015V2 Johnson on Apr 28, 2017


Date & Time: Apr 28 2017, from 24:46 to 25:04 JST(+0900)
Composed 7 shots with 3min. exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with a conversion lens (f=1600mm, F6.3)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi 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 about a degree west from the phi Her, a leg star of Hercules. The brightness of comet has reached to 7th magnitude, you can detect an evolved fan-like dust tail in west direction. The highly-condensed coma enables us to observe it through the binocular-aided eyes.
  View angle: 0.84×0.56°


Comet 2015V2 Johnson on May 20, 2017
Comet 2015V2 Johnson on Apr 15, 2017

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