M51 HaLRGB (Marc Mantha)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: HD117815 · IC 4263 · IC 4277 · IC 4278 · M 51 · NGC 5194 · NGC 5195 · Whirlpool Galaxy

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M51 HaLRGB

Revision title: Different crop and darker background

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M51 HaLRGB

Revision title: Different crop and darker background

M51 in HaLRGB, taken using with a focal lenght 430mm, so I suded 2x drizzle, very pleased by the results!

Taken over multiple nights in January and February 2024 from my bortle 8 backyard.

I added Ha data to make the nebulosity inside galaxy pop out, without that data those details are compltly washed out from the broadband red channel under heavy light pollution. I had a hard time integrating that narrowband channel into the RGB data. In the end, the trick was to use the clone the stretched, starless, Ha image to create a mask and apply it the stretched LRGB starless image. I then applied the following pixelmath straight to the masked LRGB image:

R=max($T[0]+2.25*Ha)
G=$T[1]
B=$T[2]

I had been so long since I had processed data, I was rusty. Still need some practice!

Hope that you like you like it!

Original
Final
B

B

Title: Different crop and darker background

Description: Keep the background of the LRGB version and used a masked for the HaLRGB version of the galaxy.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	9304400
PixInsight job	CW4Q1WRJSC6ZUJ1VWGHSSJYUOPBKC8XI
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h29m58s.652
RA (top/left)	13h33m48s.850
RA (top/right)	13h25m44s.174
RA (bottom/right)	13h26m13s.586
RA (bottom/left)	13h34m09s.517

Dec (center)	+47°11′50″.93
Dec (top/left)	+47°41′21″.33
Dec (top/right)	+47°34′38″.25
Dec (bottom/right)	+46°41′52″.80
Dec (bottom/left)	+46°48′28″.99

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M51 HaLRGB

Revision title: Different crop and darker background

M51 HaLRGB

Revision title: Different crop and darker background

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M51 HaLRGB

Revision title: Different crop and darker background

M51 HaLRGB

Revision title: Different crop and darker background

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