Comet Holmes on Dec 8, 2007


f=742mm prime focus

Date & Time: Dec 8 2007, from 22:04 to 22:21 JST(+0900)
Composed 4shots with 5 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon with a conversion lens (f=742mm, F4.6)
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



f=200mm telephoto / f=50mm wide-angle

Date & Time: (left) Dec 8 2007, from 22:08 to 22:25 JST(+0900), 5min.×4shots
(right) Dec 8 2007, from 25:00 to 25:11 JST(+0900), 5min.×3shots
Optical: (left) AF zoom-Nikkor ED 80-200mmF2.8 (f=200mm, Aperture: F3.2)
(right) TAMRON SP 17-50mmF2.8 (f=50mm, Aperture: F3.2)
Auto-guided with TAKAHASHI JP Equatorial
Digital Camera: Nikon D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3008×2000)
CCD Sensitivity...ISO800


I have observed the comet Holmes in that day with an apparent diameter of a bit larger than 50 arc minutes and a coma brightness of about 4th magnitude. It's getting larger and larger the coma diameter day by day, but dimmer certainly. It's hard to detect outer edge with telescope-aided eyes.


Holmes on Dec 13 till 15, 2007
Holmes on Dec 1, 2007

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