Whirlpool Galaxy (M51, NGC 5194, Arp 85) and the companion NGC 5195, spiral Galaxy type Sc galaxy (Seyfert 2), in Canes Venatici

LRGB combination (Click for a larger view 1400 x 1400 px)


An ilustration of a precision work of ASA DDM85 mount.

Single 15 min unguided Luminace frame (crop and levels adjusted). The elongated stars on the left and right are due to the flattener not to the mount.

(Click for a larger view 1400 x 1400 px)



Whirlpool Galaxy (M51, NGC 5194) and the companion NGC 5195, spiral Galaxy type Sc galaxy (Seyfert 2), in Canes Venatici.

The famous Whirlpool galaxy Messier 51 (M51, NGC 5194) is one of the most conspicuous, and probably the most wellknown spiral galaxy in the sky. M51 is the dominating member of a small group of galaxies, which also contains M63 and a number of fainter galaxies. As it is about 31 million light years distant and it is actually a big and luminous galaxy. According to the present understanding, the pronounced spiral structure is a result of M51's current encounter with its faint neighbor, NGC 5195. Due to this interaction, the gas in the galaxy was disturbed and compressed in some regions, resulting in the formation of new young stars.

Discovered by Charles Messier on October 13, 1773.

Right Ascension 13 : 29.9 (h:m)
Declination +47 : 12 (deg:m)
Distance 31000 (kly)
Visual Brightness 8.4 (mag)
Apparent Dimension 11 x 7 (arc min)

Seeing: Pickering 8 rating - Good to Excellent
Optic(s): Celestron 11" Schmidt Cassegrain + TS2" flattener @ f/8
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics L, R, G, B set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-04-22
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 60 min, R = 75 min, G = 60 min, B = 60 min, (Bin 1), Subexposures = 15 min, Total Exposure Time - 255 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.