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Comet C/2012 S1 (ISON) - Update 2013, Oct. 2

2 Oct 2013, 10:16 UTC
Comet C/2012 S1 (ISON) - Update 2013, Oct. 2
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We obtained further follow-up on C/2012 S1 (ISON) on 2013, Oct. 1.2, through the 2.0-m f/10.0 Ritchey-Chretien + CCD + SDSS r' Filter of Liverpool Telescope (MPC code J13).Stacking of 20 exposures, 11-seconds each, produced an image where is visible a well developed coma and tail measuring at least 3 arcmin extended toward PA 297 deg. Click on the image for a bigger version.Below another elaboration of the same stacking. Click on it for a bigger version.Just out of curiosity, in this ISON field there are 2 known asteroids (31176) 1997 XL9 (magnitude ~18) & (11293) 1991 XL (magnitude ~18.5). We have highlighted here the position of the asteroids: In the image below you can see 3 different elaborations of the ISON inner coma. The first panel on the left is a Larson-Sekanina filter. In the middle panel elaboration with the MCM filter creates an artificial coma, based on the photometry of the original image, and subtract the original image itself in order to highlight the internal zones of different brightness that are very close to the inner core and that would normally be hidden from the diffuse glow of the comet. While the last panel on the right is ...

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