The Dim Halo of Andromeda (Todd Stephens)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 32 And · 35 And · 35 nu. And · Andromeda Galaxy · HD3141 · HD3396 · HD3431 · HD3447 · HD3741 · HD3765 · HD3827 · HD3969 · HD4143 · HD4174 · HD4267 · HD4322 · HD4501 · HD4669 · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · The star 32 And · The star ν And

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The Dim Halo of Andromeda

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The Dim Halo of Andromeda

I've shot this target a few times already, but I wanted to try to bring together both the huge dynamic range of m31 itself, plus show some of the integrated flux nebula in the foreground. My previous image with my 135mm lens brought out the IFN nicely, but made a muddled mess of the galaxy itself. This was an attempt to balance both of them in one image.

I shot this over four nights, with the first three going to RGB with my CEM40, Canon 600D, and AT60ED reduced to 288mm. The fourth night was shot with my mono-converted 60D and Astronomik 6-nm clip filter to get some of the star-forming regions in the arms. The RGB exposures were 120-seconds each at ISO 800, and the narrowband were 300-seconds at ISO 1600. Each session calibrated with 30 each flats, dark flats, and darks, plus a master bias for each camera to scale the master dark. Calibrated, stacked, and light pollution removed in Astro Pixel Processor, with final processing in PixInsight.

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Status	Advanced success
Started	...
Astrometry.net job	6288079
PixInsight job	KDFHQMNOXY33OCK2QEENIRMPXLD3HR68
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m38s.46
RA (top/left)	00h50m26s.60
RA (top/right)	00h49m48s.15
RA (bottom/right)	00h34m18s.66
RA (bottom/left)	00h35m55s.78

Dec (center)	+41°18′03″.0
Dec (top/left)	+39°13′50″.4
Dec (top/right)	+43°29′06″.6
Dec (bottom/right)	+43°20′24″.3
Dec (bottom/left)	+39°05′36″.8

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The Dim Halo of Andromeda

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