Comet Churyumov-Gerasimenko on Dec 4, 2021


Date & Time: Dec 4 2021, from 23:47 to 24:16 JST(+0900)
Composed 8 shots with 4 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 & Lacerta M-GEN
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


The comet Churyumov-Gerasimenko is moving eastward slowly in the northern region of Cancer. In that day the comet has positioned at 2 degrees SE of ι-Cnc; I could observe a 9th magnitude coma and 20 arc minutes-long dust tail in west direction. It could be confirmed that the greenish ionized composition around coma had evolved as with the previous observation.
  View angle: 0.70×0.70°


Churyumov-Gerasimenko on Dec 10, 2021
Churyumov-Gerasimenko on Nov 5, 2021

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