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C/2012 S1 ISON with FSQ-106ED October 16, 2013UTC | by hirocun
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C/2012 S1 ISON with FSQ-106ED October 16, 2013UTC

Tail length was about 20 arcminutes at the night. North is up.

 

The length was about 4 arcminutes on September 16, 2013UTC. It got longer by 5 times in a month.

www.flickr.com/photos/hiroc/9795767185/

 

This 1,395 x 970 - pixel frame is cropped of full 5,634 x 3,753 - pixel frame. If I use a scope with focal length about 2.1m, I may be able to take a frame of this scale without cropping.

 

equipment: FSQ-106ED and EOS 5Dmk2-sp2, modified by Seo-san on EM-200 temma 2 jr. autoguided with FS-60C, Lodestar Autoguider, and PHD guiding at the center of the condensation of the coma

 

exposure: 2 times 1,020 seconds at ISO 800 and f/5.0

 

The first exposure started at 18:56:02UTC and the last at 19:13:11UTC on October 16, 2013

 

site: 717m above sea level at lat. 35 50 03 N. and long. 138 18 00 E. in Hakushu, Yamanashi 山梨県北杜市白州

Ambient temperature was around 5 degrees Celsius, and SQM-L read as 21.07 at the best.

 

Here is a view of the site taken while this exposure for 17 minutes.

www.flickr.com/photos/hiroc/10344445405/

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Taken on October 16, 2013