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C/2012 S1 ISON with FSQ-106ED October 9, 2013UTC | by hirocun
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C/2012 S1 ISON with FSQ-106ED October 9, 2013UTC

The tail got longer around 15 arcminutes, and the green halo got stronger. The green halo looked wider in the northern side again. Ion tail was not visible yet at the night. (I have updated this frame with multiple step exposure data. )


I tried autoguiding at condensation of the comet and succeeded as described here.


This 1,153 x 841- pixel frame is cropped of full 5,634 x 3,753 - pixel frame. If I use a scope with focal length about 2.5m, I may be able to take a frame of this scale without cropping.


equipment: Takahashi FSQ-106ED and Canon EOS 5Dmk2, modified by Seo-san on Takahashi EM-200 temma 2 jr. equatorial mount, autoguided with parallel set Takahashi FS60C, D60 f/5.9 Fluolite apo-refractor, Starlightxpress Lodestar Augoguider, and PHD guiding


exposure: 2 times x 900 seconds, 2 x 240sec, and 9 x 60 seconds at ISO 800 and f/5.0


First exposure began at 18:47:23UTC on October 9, 2013.


site: 2,000m above sea level at lat. 35 21 56 N. and long. 138 46 34 E. on the eastern shoulder of Mt. Fuji

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Taken on October 9, 2013