C/2012 K1 Panstarrs

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Stefan,
WO FLT98 und QHY22 für L-Kanal, 53 x 5min
Borg 71FL und QHY8 für RGB, 61 x 5 min
Grüße,
David
 
Hallo David,

danke! 4,5h sind eine Menge, das erklärt, wieso der Plasmaschweif so deutlich heraus kommt. :) Wie hast du die Sterne und den Kometen getrennt? Sigma Combine mit der Methode von Bernhard Hubl?

Viele Grüße
Stefan
 
Stefan,

I will try to answer in English since I am not good in German, hope this is OK.

I have register same frames twice (actually twice for L channel, and than repeated whole procedure for RGB as well...), first time registered on stars, second time on comet. Then I have integrated both series with aggressive sigma clipping, as you have already guessed. Since during imaging, comet moved more than its size, first series gave me star field (almost) without comet, while second series give me just a comet, without stars.

Then I have combined L with RGB channel, both registered on stars to get colour image of the star field. And than same for L and RGB registered on comet to get colour comet image. And at the end, I have combined comet over star field, so the comet position is approximately on May 5th 1:00 CET ...

Regards,
Davdi
 
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David,

Sure, thought you were German. This is a pretty time-comsuming processing technique but the results speaks for itself. Marvellous! I have tried that procedure only once but did not receive acceptable star rejection by sigma combine. Maybe it is all about fine tuning the sigma parameters. Which tool did you use for the sigma combine?

Cheers,
Stefan
 
Stefan,

All pre-processing is done with Pixinsight, just final merging of comet with star field is done in PhotoShop.

In my opinion, to get good rejection, you have to:
1. capture enough frames so that comet moves more than its size, therefore you have enough frames of each part of star field without comet and vice versa.
2. use very aggressive sigma clipping parameters during integration.
However you still lose some details by that. Now I am just processing a version with much more detail in gas tail, but without star field. Will post it here when ready in a hour or two.

Regards,
David
 
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