Comet 2012S1 ISON on early morning of Nov 22, 2013


Date & Time: Nov 21 2013, from 29:02 to 29:09 JST(+0900)
Composed 8 shots with 1min. exposed
Optical: VIXEN 20cm(7.9") VISAC with a conversion lens (f=1278mm, F6.4)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 600D (Remodeled)
Location: Kujihama, Hitachi city, Ibaraki pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO1600
A lower image has emphasized with the rotational-gradient process




Date & Time: Nov 21 2013, from 28:50 to 29:07 JST(+0900)
Composed 15 shots with 1min. exposed
Optical: BORG 60ED with a conversion lens (f=297mm, F5.0)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 550D (Remodeled)
Location: Kujihama, Hitachi city, Ibaraki pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO800




Date & Time: Nov 21 2013, from 28:58 to 29:04 JST(+0900)
Composed 10 shots with 30sec. exposed
Optical: AF zoom-Nikkor ED 80-200mmF2.8 (f=200mm, F4.5)
Auto-guided with EYEBELL CD-1 portable Equatorial
Digital Camera: Nikon D700
Location: Kujihama, Hitachi city, Ibaraki pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(2784×1848)
Device Size...DX format (24×16mm)
Sensitivity...ISO800, White Balance...Daylight


The comet ISON in that day has moved to the eastern edge of Virgo, positioned at about 13 degrees ESE of Spica. The elevation of the comet at start of the twilight had only 3 degrees, I could not detect the detailed structures of coma nor ionized tails. But the 2nd and the 3rd images could catch a dimmed tail stretched over 5 degrees. Those images show that the tail has complicated structures with several curves. The coma is getting brighter and brighter day by day, it seems that the coma has about 3rd or 4th magnitude. I could somehow detect the coma only with my naked eyes.
  The 1st image: Cropped with an equivalent f=1350mm. (View angle: 0.94×0.53°)
  The 2nd image: Cropped with an equivalent f=400mm. (View angle: 3.19×2.13°)
  The 3rd image: View angle: 4.56×6.86° (Zenith in upper)


2012S1 ISON on early morning of Nov 23, 2013
2012S1 ISON on early morning of Nov 20, 2013

Copyright(c) 2013 by Naoyuki Kurita, All rights reserved.
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