Comet 2012K5 LINEAR on early morning of Dec 9, 2012

Date & Time: Dec 8 2012, from 27:47 to 28:45 JST(+0900)
Composed 6 shots with 7 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain, with a conversion lens (f=1790mm, F7.1)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D700
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(2784 x 1848)
Device Size...DX format (24 x 16mm)
Sensitivity...ISO2500, White Balance...Daylight

The comet 2012K5 LINEAR in that day has been positioned at about 45 arc minutes west of eta UMa, a tip star of Big Dipper. The comet has a 9th magnitude coma and a dust tail stretched in northwest with a length of 10 arc minutes or so. I think the tail has more length actually because the night sky had the Moonlit of 25 aged moon. And the coma was surrounded by indistinct greenish ion composition.

2012K5 LINEAR on Dec 22, 2012

2012K5 LINEAR on early morning of Nov 18, 2012

Copyright(c) 2012 by Naoyuki Kurita, All rights reserved.
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