Comet Holmes on evening Nov 3 till early morning Nov 4, 2007


f=1600mm prime focus (Change in 9 hours)

Date & Time: (left)Nov 3 2007, from 19:22 to 19:58 JST(+0900), 1min. x 7 & 4min. x 6
(right)Nov 3 2007, from 27:54 to 28:37 JST(+0900), 1min. x 8 & 4min. x 8
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 x 2592)
CCD Sensitivity...ISO1600




f=530mm prime focus

Date & Time: Nov 3 2007, from 21:15 to 21:32 JST(+0900)
composed 4shots with 15sec.(ISO800) & 4shots with 3min.(ISO1600)
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 x 2016)
White Balance...Auto




The ion-tails of comet Holmes

  The emphasized reversed image of a color photo above




f=200mm telephoto (Comet Holmes & an open cluster Mel.20)

Date & Time: Nov 3 2007, from 19:24 to 19:35 JST(+0900)
composed 8shots with 1min. exposed
Optical: AF zoom-Nikkor ED 80-200mm F2.8 (f=200mm, Aperture: F2.8)
Auto-guided with Meade LX200 Equatorial
Digital Camera: Nikon D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3008 x 2000)
CCD Sensitivity...ISO1600




The first set of comet Holmes shows you the close-up images captured with an interval of about 9 hours in single night. I have measured their diameters, it was increased about 4% from 13.77 to 14.33 arc minutes. And we can see an indistinct dark-ring structure in the coma. It's considered that the coma has a "sphere shell" structure, and almost hollow inside the shell.
In that night I had a fairly good transparency condition without the Moonlight, could observe the dimmed distribution of ionized composition of the comet. The second shot shows us a diameter of the greenish blued ionized coma has about 36 arc minutes, exceeds that of the Moon. And an emphasized reversed image of blue channel shows us extraordinary dimmed several stripes of ion tails stretching in south and west direction.





Holmes on Nov 7, 2007

Holmes on early morning of Nov 3, 2007


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