46P from 07-11-2018

[Stefan Buda]

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.

[Atmos]

Was this with the 100mm or 150mm?

[Stefan Buda]

Colin,
It was the 150/450. The 100/450 is the finder/guider.

[Atmos]

Didn’t realise the 100mm had the same focal length as the 150.

Hope you can get the stray light narrowed down :)

[silv]

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?

[Stefan Buda]

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.

[bojan]

This is PGC0007664, spiral, see chart attached.

[cometcatcher]

That's really nice Stefan.

[silv]

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?

[bojan]

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