Fireworks Galaxy NGC6946 in Cepheus - LHaRGB (Arnaud Peel)

Fireworks Galaxy NGC6946 in Cepheus - LHaRGB

I had no time to collect RGB so I use my last year subs to colorize the new Light subs. I also did some Halpha subs which completly enhance the vision of the red nodules and star remnants.

I finaly tuned my EQ8 to guide around (or less than) 0.5" depending of the seeing with perfect balacing and correct backlash in AD and DEC, but nonetheless ... a second hand AP1100 came by , and I could not resist :-) so this is the first picture with this mount .

Good guiding make a BIG difference , the FWHM obtain for the light subs were very good : 80% below 2.3", 52% below 2.1"

I keep the best selected frames (50%) for the core of the galaxy and used all the subs for the background.

The result is much more detailled !

With this version , I try to show the extension as much as possible trying to keep the noise below visibility , and process the center to get the core details as well.

NGC 6946 also known as the Fireworks Galaxy is between the northern constellations of Cepheus and Cygnus. Its distance from Earth is about 25.2 million light-years.

Discovered by William Herschel on 9 September 1798, this well-studied galaxy has a diameter of approximately 40,000 light-years, about one-third of the Milky Way's size, and it contains roughly half the number of stars as the Milky Way. The galaxy is heavily obscured by interstellar matter as it lies quite close to the galactic plane of the Milky Way. Due to its prodigious star formation it has been classified as an active starburst galaxy.

Red 15subs@180s -20°C gain zero

Blue 15subs@180s -20°C gain zero

Green 15subs@180s -20°C gain zero

Light 106 subs@180s -20°C, gain zero

Halpha 16 subs@300s -20°C, gain 139

5 Nights : 23, 29/30,30/31, 01/02 02 of July , and August

Original
Final
F
G

F

Description: Core Enhanced

Uploaded: ...

G

Description: Square frame

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	2872539
PixInsight job	4M1500R74Q6LILAZ8AJW6Y3YUAONKGQC
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h34m46s.583
RA (top/left)	20h37m04s.480
RA (top/right)	20h32m28s.764
RA (bottom/right)	20h32m31s.673
RA (bottom/left)	20h37m01s.874

Dec (center)	+60°09′00″.37
Dec (top/left)	+60°25′55″.73
Dec (top/right)	+60°25′52″.44
Dec (bottom/right)	+59°51′57″.73
Dec (bottom/left)	+59°52′00″.14

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