Andromeda Galaxy Mosaic in LHaRGB (jewzaam)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 32 And · 35 nu. And · Andromeda Galaxy · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · The star 32And · The star νAnd

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Andromeda Galaxy Mosaic in LHaRGB

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Andromeda Galaxy Mosaic in LHaRGB

Andromeda Galaxy is located about 2.5 million light years from us and getting closer. It's expected to collide with the Milky Way in about 4 billion years. And the galactic halos of each galaxy are likely already interacting! Shouldn't matter much to Earth though, don't worry. The sun will have started getting brighter, about to transition to a red giant star, at which point (5 billion years from now) it will expand to about Earth's orbit. Which will be a Bad Thing for life on the planet if it still exists. We may need to migrate to some of the gas giant moons, which will end up in the habitable zone...

This project started as a challenge within the Raleigh Astronomy Club. I initially thought I'd do just a quick 2 panel mosaic. It turned into a bit of an experiment. I had been shooting short L frames, 30s at gain=0, and it works. But it's a ton of files. I was trying to reduce star core saturation. But I realized I could get a similar effect by going HDR. Did some initial testing and settled on 300s long exposures with 15s short exposures. I tried it out on M31 and added some H-alpha for fun. Seems the experiment worked!

Final
Original
E

E

Description: Dropped the Ha data and processed again. Not sure I like the background but it's better than the previous version overall I think.

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Status	Advanced success
Started	...
Astrometry.net job	5392479
PixInsight job	H2DWAP8GQ4AZ9XPMWTDZCFYDDNCXUJKC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m48s.34
RA (top/left)	00h50m24s.85
RA (top/right)	00h50m56s.26
RA (bottom/right)	00h34m48s.33
RA (bottom/left)	00h35m05s.67

Dec (center)	+41°15′15″.4
Dec (top/left)	+39°25′50″.4
Dec (top/right)	+43°01′28″.9
Dec (bottom/right)	+43°02′21″.4
Dec (bottom/left)	+39°27′16″.1

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Andromeda Galaxy Mosaic in LHaRGB

Andromeda Galaxy Mosaic in LHaRGB

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Andromeda Galaxy Mosaic in LHaRGB

Andromeda Galaxy Mosaic in LHaRGB

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