Andromeda 45 minutes total integration (Timothy Straub)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 35 And · 35 nu. And · Andromeda Galaxy · HD3431 · HD3447 · HD3765 · HD4143 · HD4174 · HD4322 · HD4669 · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · The star ν And

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Andromeda 45 minutes total integration

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Andromeda 45 minutes total integration

I am working on determining the need for a light pollution filter for my field rig. My field rig is a Celestron C6 with the Starizona HyperStar v4 (300 mm fl, f/2) and the ASI 2600mc camera. My understanding is that the 2600mc has a UV/IR cut built in. I have an IDAS D3 light pollution filter, but I noticed that with the field rig, I can get some nasty halos around the brighter stars, and I can see the cabling pattern in those halos. My hypothesis is that with this compact system, the filter has a lot of internal reflections,. Living in Bortle 3 skies, I might be better off without it.

Part 1 of testing this hypothesis, I attempted Andromeda on the evening of 22 September 2023. Unfortunately, I was only able to gather 45 x 1 min frames before the clouds rolled in. I did not realize how bad the clouds were because I was attempting to gather at least 2 hrs of data. Looking at my subs, I realized there was only 45 minutes. Nonetheless, detail of the galaxy. appears to be good and halos were at a minimum.

I used WBPP to calibrate, normalize, drizzle integration and autocrop. I used the master autocropped drizzle file and went through a fairly standard work flow: DBE, SCNR, SPCC, BlurX, NoiseX, StarX. For the starless image I used GHS and then used the GAME script to create masks for Andromeda and M110 to bring up brightness/details of the galaxies, and then reversed the mask to bring down the background. For stars I did a simple histogram stretch (linear) and curves to bring up saturation. Pixel math was used to combine starless and star images into a final image that was exported as a tif. I used Adobe Camera RAW smart filter to make final adjustments.

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Status	Advanced success
Started	...
Astrometry.net job	8493756
PixInsight job	D4NXBGK1FMOMC0AM5XLWMWT05MBD5QYN
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m46s.15
RA (top/left)	00h47m45s.68
RA (top/right)	00h52m37s.97
RA (bottom/right)	00h37m29s.90
RA (bottom/left)	00h33m11s.63

Dec (center)	+41°16′08″.7
Dec (top/left)	+39°26′12″.5
Dec (top/right)	+42°12′30″.8
Dec (bottom/right)	+43°05′19″.7
Dec (bottom/left)	+40°16′45″.1

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Andromeda 45 minutes total integration

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