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Contains:  NGC 6946
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Fireworks Galaxy  NGC6946 in Cepheus  - LHaRGB, 





    
        

            Arnaud Peel
Fireworks Galaxy  NGC6946 in Cepheus  - LHaRGB

Fireworks Galaxy NGC6946 in Cepheus - LHaRGB

Technical card

Resolution: 2600x2600

Dates:Aug. 4, 2019

Frames:
Baader Ha 7nm 36mm Baader: 16x300" (gain: 139.00) -20C bin 1x1
ZWO 36mm LRGBHOS Filter Set: 151x180" -26C bin 1x1

Integration: 8.9 hours

Avg. Moon age: 3.89 days

Avg. Moon phase: 16.20%

Astrometry.net job: 2872539

RA center: 20h 34' 46"

DEC center: +60° 9' 0"

Pixel scale: 0.784 arcsec/pixel

Orientation: 0.046 degrees

Field radius: 0.400

Locations: au Pied du Ventoux, Ventoux, 84, France

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

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

Comments

Author

Arnaudf92
Arnaud Peel
License: None (All rights reserved)
1643
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Revisions

  • Fireworks Galaxy  NGC6946 in Cepheus  - LHaRGB, 





    
        

            Arnaud Peel
    Original
  • Fireworks Galaxy  NGC6946 in Cepheus  - LHaRGB, 





    
        

            Arnaud Peel
    F
  • Final
    Fireworks Galaxy  NGC6946 in Cepheus  - LHaRGB, 





    
        

            Arnaud Peel
    G

F

Core Enhanced

G

Square frame

Sky plot

Sky plot

Histogram

Fireworks Galaxy  NGC6946 in Cepheus  - LHaRGB, 





    
        

            Arnaud Peel