Celestial hemisphere:  Northern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  Solar system body or event
C/2017 K2 Panstarrs, Kathy Walker
C/2017 K2 Panstarrs
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C/2017 K2 Panstarrs

C/2017 K2 Panstarrs, Kathy Walker
C/2017 K2 Panstarrs
Powered byPixInsight

C/2017 K2 Panstarrs

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Description

Comet C/2017 K2 Panstarrs, in monochrome, from June 6th.  This was difficult to process.  I followed Harry's comet processing tutorial, but it failed where it always has in the past: pixel rejection in the comet integration doesn't remove the streaked stars entirely. I ended up using a different process that required removing the stars from each frame separately, using Starnet.  I then did the Comet Align of the starless frames, followed by Integration of the comet.  It was tedious, but produced a much more satisfactory result.  I used Starnet again to produce a stars-only version of the original Master image, and the PixelMath-ed the comet and the stars.  I want to do a colour version, but so far, weather and equipment have not cooperated.

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