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C/2012 S1 ISON with FSQ-106ED and Reducer QE 0.73x November 15, 2013UTC Quick Version | by hirocun
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C/2012 S1 ISON with FSQ-106ED and Reducer QE 0.73x November 15, 2013UTC Quick Version

I could image the comet after the outburst on November 14, 2013.


This is a quickly processed version. North is up, and East is to the left.

Here is the multiple-length exposure version.


The coma looked elongated in north to south direction on a frame with exposure for one second.


There seems to exist not only bluish but yellowish white part in the complex structure of the tail. Vikrant Kumar Agnihotri presented a result of spectral analysis of the comet on November 16 with Rspec star analyzer SA-100 showing that there were emission lines of C2 and one near 600nm.


I suspect the line near 600nm may be of sodium, Na, at 589.6nm and 589.0nm. The comet may already have been showing sodium tail two weeks before the perihelion on November 28, 2013.



I feel that this appearance of comet with multiple streams of plasma tail resembles those seen in the dramatic outburst of 17P/Holmes in November 3, 2007.


equipment: Takahashi FSQ-106ED refractor with Reducer QE 0.73x at f/3.6 and Canon EOS 5Dmk2-sp2, modified by Seo-san on Takahashi EM-200 temma 2 jr. equatorial mount autoguided at the center of the condensation of the coma with side by side mounted Takahashi FS-60C, Starlightxpress Lodestar Autoguider, and PHD guiding


exposure: 4 times x 180 seconds at ISO 1,600 and f/3.6

First exposure started at 19:52:06 and the last at 20:01:36 November 15, 2013UTC.


site: 1,423m above sea level at lat.35 55 22 N. and long. 138 24 30 E. near Kiyosato

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Taken on November 15, 2013