Comet Holmes on Nov 11, 2007


f=1600mm prime focus

Date & Time: Nov 11 2007, from 19:53 to 20:06 JST(+0900)
composed 4shots with 4 minutes 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 D80 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

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



f=530mm prime focus

Date & Time: Nov 11 2007, from 18:55 to 19:18 JST(+0900)
composed 4shots with 1min. & 4shots with 5min. exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
Auto-guided with TAKAHASHI JP Equatorial
Digital Camera: Fujifilm FinePix S2Pro
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto


The comet Holmes in that day has a brightness of about 3.5th magnitude and an apparent diameter of 25 arc minutes. The real diameter has been estimated over 1.5 millions kilometers, exceeding that of the sun. The comet Holmes has become the biggest object in the solar system.
It's reported that the ion tail of the comet observed on Nov 7 has been come off in next day. And in the day this picture has captured we can see an indistinct piece of the ionized matters around 1.5 degrees southwest from the coma. And it can be observed that the coma has lost almost bluish ionized composition.


Holmes on Nov 14, 2007
Holmes on Nov 7, 2007

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