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M74 (NGC 628) - Spiral Galaxy , type Sc, in Pisces.

LRGB combination 100% crop - (Click for a larger view 1800 px x 1800 px)

 

 

LRGB combination - (Click for a larger view 1800 px x 1800 px)

Details

M74 (NGC 628) - Spiral Galaxy , type Sc, in Pisces

Discovered 1780 by Pierre Mechain.

M74 (NGC 628) is is one of the best examples of a face-on Sc-type spiral galaxy in a distance about 36 million light years. The spiral arms are about 1000 light years broad. They are traced with clusters of blue young stars and pinkish colored diffuse gaseous nebulae (H II regions). The diameter of M74 is about 95000 light years, or about the same size as our Milky Way galaxy. The nucleus of Sc spiral galaxy M74 is small and bright. The large number of H II regions and the pronounced spiral pattern indicate that star formation currently occurs vividly in M74's disk. The remarkably symmetric appearance over the whole galaxy is probably caused by the global phenomenon of density waves sweeping around M74's gaseous disk, probably induced by gravitaional interaction with neighboring galaxies. M74 is probably the main member of a very small physical group of galaxies, which includes the peculiar barred spiral NGC 660, the peculiar UGC 891 and the irregulars UGC 1176, UGC 1195, and UGCA 20.

North is up. The Horizontal FOV is about 35' (crop from original FOV). The image almost centered at:
Right Ascension 01:36:41.84 (h:m:s)
Declination +15:46:59.6 (deg:m:s)
Distance 35 000 (kly)
Visual Brightness B=10.5, V=9.4 (mag)
Apparent Dimension 10.47′ x 9.549′ (arc min)

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: 2012-09-13
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 40 min, R = 40 min, , G = 40 min, , B = 40 min, subs. 10 min, Bin 1, Total Exposure Time - 160 min

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

PixInsight / PS

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All Contents copyright Velimir Popov unless otherwise noted.