NGC 6946 (Arp 29, UGC 11597) - Spiral Galaxy type Scd, in Cepheus .

LRGB combination - (Click for a larger view 1600 px x 1600 px)



LRGB combination - 100% crop


Inverted B/W - 100% crop



NGC 6946 (Arp 29, UGC 11597) - Spiral Galaxy type Scd, in Cepheus

Discovered by William Herschel in 1798.

NGC 6946, also known as the Fireworks Galaxy, is a face-on spiral galaxy about 10 million light years away beyond a multitude of forground stars within our own galaxy. It spans nearly 40000 light-years across. Nine supernovae have been discovered in NGC 6946 since 1917, which is a sign of an abnormally high star formation rate. NGC 6946 is one of the nearest giant spiral galaxies, which at one time was suspected to be an outlying member of the Local Group. It is highly obscured by interstellar matter of the Milky Way galaxy, as it is located only 11 degrees off the plane of it. NGC 6946 has a high level of star formation throughout its disk. One of the most interesting features of this galaxy is a peculiar stellar complex (bright blue knot) to the west of the galaxy center. This formation is one of the brightest supercluster of young, blue stars known in the disk of any spiral galaxy.

North is up. The Horizontal FOV is about 30' (crop from original FOV). The image almost centered at:

Right Ascension 20:34: 51.4 (h:m:s)
Declination +60:09:18 (deg:m:s)
Distance 10 000 (kly)
Visual Brightness B=10.5, V=8.2 (mag)
Apparent Dimension 11.5' x 10' (arc min)

Seeing: Pickering 8 rating - Very good
Optic(s): RC 12" with Astro-Physics corrector @ f/5
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik LRGB set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-08-24
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 60 min, R = 60 min, , G = 40 min, , B = 40 min, subs. 10 min, Bin 1, Total Exposure Time - 200 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided thanks to ASA DDM85 Premium mount

PixInsight / PS


All Contents copyright Velimir Popov unless otherwise noted.