M 81 (Bode's Galaxy)

M81 (NGC 3031 or Bode's galaxy) is a spiral galaxy located in the constellation Ursa Major. Discovered in 1774 by Jan Bode and rediscovered in 1779 by Pierre Mechant and Charles Messier, this galaxy is included later in the Messier catalog under number 81. Only one supernova was observed in M81, which was a supernova of type Ib. This Supernova was used to measure the distance to the galaxy, which is estimated to be 8.5 million l.y. M81 interacts gravitationally with M82 and NGC 3077. Gas from this three galaxies appears in intergalactic space and is attracted by the gravitational forces. Thus it "falls" near the nuclei of galaxies, causing rapid star formation.


Technical Details:

Optics: ASA N12 Astrograph at 6.8 and 3.6
Mount: ASA DDM 85
Camera: SBIG STL-11000M
Filters: Astronomik LRGB filter set
Dates/Times: November 2010
Location: Rozhen
Exposure Details: L = 240 min R = 120 min, G = 110 min, B = 140 min.
Subexposures: 10 min
Acquisition: CCD Soft
Processing: PixInsight, Photoshop CS

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