M100: The Blowdryer Galaxy (in HaRGB) (David Koslicki)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: IC 783 · M 100 · NGC 4312 · NGC 4321 · NGC 4322 · NGC 4323 · NGC 4328

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M100: The Blowdryer Galaxy (in HaRGB)

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M100: The Blowdryer Galaxy (in HaRGB)

This guy took six nights for me to capture, but I'm quite happy to have captured the faint dust clouds at the end of the spiral arms of this grand design spiral galaxy (one of the first spiral galaxies to be discovered ~240 years ago!).

Having captured 160 subs on this target, I was able to do an experiment of stacking the best 50%, 60%,...,100% of subs. Interestingly, after stacking ~80% of the subs, the image basically did not change at all after that point which is somewhat surprising to me (may have turned out differently if I was using a CMOS chip instead of a CCD; I don't know). Between the two extremes of stacking 1/2 the subs or all of them, the tradeoff appears to be between capturing the faint, dusty arms of the galaxy or keeping the stars nice and sharp (due to the bottom 50% of subs having less-than-optimal focus, seeing, etc.). I decided to sacrifice the tight stars in favor of pulling out the most I could from the spiral arms.

The revision is the image without diffraction spikes.

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Original
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B

Description: Same as main photo, just no diffraction spikes.

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Status	Advanced success
Started	...
Astrometry.net job	5710845
PixInsight job	LYTA8T81VZ0GEDQ533B7IQH7Z5TVEV02
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h22m35s.774
RA (top/left)	12h23m50s.866
RA (top/right)	12h23m32s.870
RA (bottom/right)	12h21m20s.402
RA (bottom/left)	12h21m38s.900

Dec (center)	+15°41′40″.28
Dec (top/left)	+15°22′02″.90
Dec (top/right)	+16°04′34″.45
Dec (bottom/right)	+16°01′16″.96
Dec (bottom/left)	+15°18′46″.22

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M100: The Blowdryer Galaxy (in HaRGB)

M100: The Blowdryer Galaxy (in HaRGB)

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M100: The Blowdryer Galaxy (in HaRGB)

M100: The Blowdryer Galaxy (in HaRGB)

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