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Old 08-11-2018, 07:49 PM
Stefan Buda
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46P from 07-11-2018

Got to try my small Busack-Riccardi-Honders on a comet finally.
This was 40x120seconds with an old QHY8 camera. Darks and flats applied.
The first image is the full 3x2deg field. The second one is a roughly one degree field crop, at 100% resolution.

The ion tail is barely distinguishable.

I'm still getting stray light problems with the instrument. I will have to add a secondary baffle.
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Old 08-11-2018, 07:58 PM
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Was this with the 100mm or 150mm?
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Old 08-11-2018, 08:02 PM
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Colin,
It was the 150/450. The 100/450 is the finder/guider.
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Old 08-11-2018, 08:11 PM
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Didn’t realise the 100mm had the same focal length as the 150.

Hope you can get the stray light narrowed down
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Old 09-11-2018, 03:52 AM
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So beautiful. I hope to get a glimpse mid December up here on 54th North.

There's a gray, fuzzy circle at 11 o'clock, on an extended line from Witanen over HD 12475.
That fuzzy circle was not identified by nova.astrometry.net , though.

Zooming into your original stack, can you make out more detail? It doesn't look like an out of focus star, does it?
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Old 09-11-2018, 07:28 AM
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I have noticed that fuzzy spot on the very first sub I captured and kept an eye on it for a couple of hours. It did not move. This part of the sky is full of small galaxies, many of which can be easily recognised on the full frame/resolution image.
If you click on the second, cropped image, IIS should display it at full resolution and that spot is almost resolved into a spiral galaxy.
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Old 09-11-2018, 07:36 AM
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This is PGC0007664, spiral, see chart attached.
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Old 09-11-2018, 09:18 AM
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That's really nice Stefan.
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Old 09-11-2018, 04:51 PM
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Cheers Stefan and Bojan. Knowing the catalog name brought up a page where you can zoom far into the photo and see the structure
http://leda.univ-lyon1.fr/ledacat.cgi?o=pgc7664

Now to find a planetarium software which has that depth of known objects integrated. Which one are you using, Bojan?
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Old 09-11-2018, 05:35 PM
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Quote:
Originally Posted by silv View Post
Cheers Stefan and Bojan. Knowing the catalog name brought up a page where you can zoom far into the photo and see the structure
http://leda.univ-lyon1.fr/ledacat.cgi?o=pgc7664

Now to find a planetarium software which has that depth of known objects integrated. Which one are you using, Bojan?

Cartes du Ciel (v2.76), with UCAC catalogue (for stars) and Catalogue for Principal Galaxies (for nebulae)
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