Comet Tuttle on Dec 14, 2007

Date & Time: Dec 14 2007, from 19:36 to 20:09 JST(+0900)
Composed 7shots with 5 minutes exposed
Optical: TAKAHASHI 12.5cm(4.9") fluorite refractor with a conversion lens (f=700mm, F5.6)
with IDAS LPS-P2-FF Light-pollution suppression filter
Auto-guided with VIXEN ATLUX Equatorial
Digital Camera: Nikon D80 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3872 x 2592)
CCD Sensitivity...ISO1600

The comet Tuttle in that day has been positioned in northern region of Cepheus with a visual brightness of 8th magnitude. A greenish coma can be seen with telescope-aided eyes clearly, a bit spread in west direction. And the tail cannot be detected.

Tuttle on Dec 31, 2007

Tuttle on Dec 1, 2007

Copyright(c) 2007 by Naoyuki Kurita, All rights reserved.
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