Comet Wirtanen on Dec 8, 2018


Date & Time: Dec 8 2018, from 18:30 to 18:48 JST(+0900)
Composed 10 shots with 2 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
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(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight



Date & Time: Dec 8 2018, from 18:54 to 19:25 JST(+0900)
Composed 16 shots with 2 minutes exposed
Optical: BORG 67FL with conversion lens (f=324mm, F4.8)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with TAKAHASHI JP Equatorial
Digital Camera: Canon EOS 6D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648)
Device Size...36×24mm, Sensitivity...ISO4000


The comet Wirtanen in that day was positioned in north west region of Eridanus; I could find out a 4th magnitude coma at 11 degrees east of Mira, omicron Cet. Althogh I could no clear tails, a dimmed coma could be detected with naked eyes. The apparent diameter of coma exceeded a degree estimated with images, you can show that the 1st image was almost ocuppied with ionized composition of coma.
  1st image: View angle: 0.70×0.70°
  2nd image: Cropped in equivalent focal length of 500mm (View angle: 4.10×2.73°)


Wirtanen on Dec 14&15, 2018
Wirtanen on Nov 10, 2018

Copyright(c) 2018 by Naoyuki Kurita, All rights reserved.
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