Comet ISON Negative (wide+narrow) To Mag. 17.5

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Comet ISON Negative (wide+narrow) to mag. 17.5
Taken by Lorenzo Comolli on December 11, 2013 @ Tradate, Italy

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Again a negative observation of ISON. This time I was able to collect more exposure and make a very accurate flat field. I cleaned the filters and CCD, I made an accurate flat field with a flat box, and finally I made a flat refinement on a nearby sky field. This way I was able to dig into the bottom to search for any wide remnant of ISON. Unfortunately I cannot find anything convincing: the small brightness patches in the field seems more flat residuals that a remnant. I also added all exposures with alignment on the expected position, but nothing condensed is visible down to about mag. 17.5, and in a field of 2.04x1.36°. 11 dec 2013, 5.37.01 UT, 9x120s, TEC140+SBIG11k, B39 obs (Tradate, Italy) [ignore previous post, wrong image]

Photographer's website:

http://www.astrosurf.com/comolli/index2.htm

Comments

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Has the reminent of comet ISON not changed course?. When I was watching the NASA imagers during perihilion none of them showed the comet pass the sun Except LASCO 2 and 3 which meant to me that they had calculated the trajectory and timing wrong. . Could it be the case we are searching at the wrong coordinates?

Posted by Earthlander 2013-12-11 10:05:18

Hi Earthlander, I dont know if any ramnant has changed trajectory and I think it depends on the size. From the SOHO and STEREO images the large dust cloud seems to be perfectly on trajectory, afaik.

Posted by loreastro 2013-12-13 07:17:26

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