M 51 (Tom Engwall)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: IC 4263 · IC 4277 · IC 4278 · M 51 · NGC 5194 · NGC 5195 · PGC 2286797 · PGC 2287260 · PGC 2289565 · PGC 2292105 · PGC 2294282 · PGC 2297311 · PGC 2300341 · Whirlpool Galaxy

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M 51

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M 51

Another M 51 but I didn't have it in my portfolio, so here is my attempt. I tried some new techniques on this image. The most significant one was Adam Block's "Combining Ha by Continuum Subtraction". As Adam explains , star light often contains the full continuum of the visible spectrum, so the nebulosity in and around M 51 contains Ha but I only want to add that to the star forming nodes in the galaxy. His technique subtracts out that Ha continuum before adding it to the Red (and a little to the Blue) masters - using pixel math - followed by channel combination with the Luminance.This technique requires a lot of trial and error before finding the best factors but I found it to be worthwhile and useful. I probably need more experience with it but definitely will be using it in the future.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	8105392
PixInsight job	Y5WNSBP3EL2BNWG4URLJYPPPEW3M1H3S
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h29m48s.601
RA (top/left)	13h27m54s.688
RA (top/right)	13h27m56s.273
RA (bottom/right)	13h31m40s.633
RA (bottom/left)	13h31m43s.110

Dec (center)	+47°11′42″.97
Dec (top/left)	+47°40′30″.32
Dec (top/right)	+46°42′51″.60
Dec (bottom/right)	+46°42′48″.28
Dec (bottom/left)	+47°40′28″.54

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