Comet 2012S1 ISON on early morning of Nov 17, 2013


Date & Time: Nov 16 2013, from 28:39 to 28:54 JST(+0900)
Composed 15 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




Date & Time: Nov 16 2013, from 28:39 to 28:55 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


In latter half of Nov 2013 we have influences of the moonlight, so it's difficult to observe the detailed activities of the comet ISON just closing to the sun. In that day the comet has positioned at 3.5 degrees northwest of Spica, I could easily detect the coma through a binocular. The coma brightness can be estimated about 5th magnitude by comparing with stars in outskirts. Although I could detect no clear tails, the images can show an extraordinary dimmed tails with its length of about 4 degrees.
  The 1st image: Cropped with an equivalent f=1350mm. (View angle: 0.94×0.63°)
  The 2nd image: Cropped with an equivalent f=400mm. (View angle: 3.19×2.13°)


2012S1 ISON on early morning of Nov 20, 2013
2012S1 ISON on early morning of Nov 14, 2013

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