Andromeda (RGB + HII) (NeedMoreCoffee)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: Andromeda Galaxy · M 110 · M 31 · M 32 · NGC 205 · NGC 221 · NGC 224

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Andromeda (RGB + HII)

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Andromeda (RGB + HII)

Had some nice clear nights recently – I felt I had to give the Newt another go.

Am pleased I could get this despite fairly bad LP but sill lots of issues. I was forced to crop the image more than I would have wanted because of egregious coma towards the edge of the field and other distortions.

Since I have not been able get the PC to talk to the mount I still can't do any autoguiding. I did engage periodic error correction and reduced the subs to 30s (had to clean off most of a hard drive to store them!) - not sure how much the PEC helped but the shorter subs certainly did. Stars are much better (although still elliptical).

A strange issue I have not seen before: after alignment of the HII data the subs picked up a weird artifact consisting of a coarse grid across the entire image. This seemed to be exacerbated by the Lanczos-5 pixel interpolation I usually use (which normally works very well), so instead I think I used the bilinear algorithm. Although that seemed to help, the integrated HII was still full of distortions, so I had to go heavy on noise reduction. The HII component (at least) is therefore softer than it I think it should be.

Anyway, thanks for looking and any advice appreciated!

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Status	Advanced success
Started	...
Astrometry.net job	3958124
PixInsight job	1VFRS0FWTKSTMIVXXIE436TRS4H3BCJZ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h42m56s.361
RA (top/left)	00h45m38s.854
RA (top/right)	00h45m35s.730
RA (bottom/right)	00h40m11s.948
RA (bottom/left)	00h40m19s.160

Dec (center)	+41°16′47″.56
Dec (top/left)	+40°52′00″.97
Dec (top/right)	+41°42′26″.30
Dec (bottom/right)	+41°41′18″.78
Dec (bottom/left)	+40°50′54″.54

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Andromeda (RGB + HII)

Andromeda (RGB + HII)

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Andromeda (RGB + HII)

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