Comet Holmes on Nov 14, 2007


f=742mm prime focus

Date & Time: Nov 14 2007, from 20:50 to 21:13 JST(+0900)
composed 4shots with 1min. & 4shots with 4min. exposed
Optical: TAKAHASHI 16cm(6.3") epsilon with a conversion lens (f=742mm, F4.6)
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Fujifilm FinePix S2Pro
Location: Narusawa vil., Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3024 x 2016)
CCD Sensitivity...ISO1600, White Balance...Auto
Trimmed equivalent to f=1200mm




200mm telephoto (Comet Holmes & Mel.20)

Date & Time: Nov 14 2007, from 20:11 to 20:37 JST(+0900)
composed 6shots with 1min. & 4shots with 4min. exposed
Optical: AF zoom-Nikkor ED 80-200mm F2.8 (f=200mm, Aperture: F3.2)
with IDAS LPS-P2-FF Light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Nikon D80 (Remodeled)
Location: Narusawa vil., Yamanashi pref.

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




Comet Holmes by fixed camera

Date & Time: Nov 14 2007, from 21:40 to 21:45 JST(+0900)
composed 3shots with 2min. exposed
Optical: SIGMA 15mm EX Fisheye F2.8, Aperture: F3.3
Digital Camera: Fujifilm FinePix S2Pro
Location: Narusawa vil., Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3024 x 2016)
CCD Sensitivity...ISO800, White Balance...Auto




The comet Holmes in that day with an apparent diameter almost same as that of the Moon has been positioned just east of alpha Per. The comet has a visual brightness of about 3.0 or 3.5th magnitude, almost same when I observed on Nov 11. The coma has almost no ionized gas, only detectable white dust composition looks like a jerry fish.




Holmes on Nov 16 & 17, 2007

Holmes on Nov 11, 2007


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