The whirlpool Galaxy - M51 - HaLRGB (Arnaud Peel)

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

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The whirlpool Galaxy - M51 - HaLRGB

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The whirlpool Galaxy - M51 - HaLRGB

Another try at M51 with Ha this time and much more exposure time :

11hours 15min for LRGB and 10hours 05min for Halpha .

I processed the subs and the image with the same method use for M101 my previous image.

For the Light , I selected around 30% of the best Fwhm subs and combined them with all the subs to get sharper details ands smaller stars.

I started with 3 nights : 05, 06, and 08 of February, but I was not happy with the background noise, so I almost double the number of subs , the 23, 24 and 25 of February ...

Red 32 subs@180s -20°C gain 139

Blue 30 subs@180s -20°C gain 139

Green 29 subs@180s -20°C gain 139

Light 134 subs@180s -20°C, gain 139 and zero

Halpha 121subs@180s -20°C gain 139

Tell me what you think ?

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Description: Square Zoom

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Description: Less sharpen !

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Status	Advanced success
Started	...
Astrometry.net job	2585376
PixInsight job	491TT7JXDOZOTM6P84M1CO48Q6EIHGCU
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	13h29m52s.645
RA (top/left)	13h27m58s.211
RA (top/right)	13h28m11s.277
RA (bottom/right)	13h31m45s.936
RA (bottom/left)	13h31m35s.463

Dec (center)	+47°11′53″.85
Dec (top/left)	+47°29′09″.86
Dec (top/right)	+46°52′30″.36
Dec (bottom/right)	+46°54′29″.52
Dec (bottom/left)	+47°31′11″.76

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The whirlpool Galaxy - M51 - HaLRGB

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