Andromeda in Narrowband (no RGB) (DanielZoliro)

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

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Andromeda in Narrowband (no RGB)

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Andromeda in Narrowband (no RGB)

I wanted to experiment with shooting Andromeda using only narrowband filters. I've seen a lot of really M31 images in HaRGB, but I don't know of any instances where only narrowband filters were used. Doing a quick search online shows a few threads where people ask about doing M31 only in narrowband, but the responses from others generally say it's a waste of time to try it.

Now I do understand that M31 is a very bright object and I'm only using the 7nm, 7.5nm, 8.5nm NB filters, so I'm sure they let some of M31's natural light pass through (especially in OIII) but I'm not sure how much. Nonetheless, I was able to capture more of the dust lanes very close to the core of M31 than I ever have before. Since I was just experimenting, I only shot 25x120" subs with each filter for a total integration time of 2.5 hours. It's a bit noisy and I'm willing to bet I could capture more details in the inner dust lanes if I add more time to it. Also, something funny is that I used a gain of 111 which is unity gain for my ASI183mm while I usually use a gain of 200 on the ASI1600mm. I just forgot to change it in the ASIair Pro LOL.

For the color palette, I assigned Ha to red, SII to green, and OIII to blue for an "HSO" palette using Pixinsight. This combination gave me the most natural color combination. The image scale is 0.53"/pixel at a focal length of 1480mm using a Celestron 9.25" SCT with an ASI1600mm Pro and a Starizona SCT Corrector.

I would be interested to know what you guys think and if any one else has experimented with M31 in narrowband or any other galaxies for that matter.

Clear Skies,
Daniel

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Status	Advanced success
Started	...
Astrometry.net job	5216793
PixInsight job	GVKJ2I42NQ74ZM6HP5RIF9NHZ77GTKO4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m46s.544
RA (top/left)	00h44m16s.528
RA (top/right)	00h44m30s.890
RA (bottom/right)	00h41m16s.370
RA (bottom/left)	00h41m03s.776

Dec (center)	+41°15′54″.90
Dec (top/left)	+40°59′48″.34
Dec (top/right)	+41°28′51″.55
Dec (bottom/right)	+41°31′52″.60
Dec (bottom/left)	+41°02′50″.76

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Andromeda in Narrowband (no RGB)

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