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Name / Constellation

M 81

 Other: NGC 3031 - UGC 5318 - PGC 28630 - Bode Nebula

UMa
Coordinates AR: 09h 55m 33.2sec - Dec: +69° 03' 55"
Optics Richtey-Chretien Officina Stellare 10"@F8 Carbon Truss
Camera-Mount SBIG ST10XME/CFW10/ONAG/ST8300 guider - 10Micron GM2000 QCI Mount
Filters Astrodon LRGB TruBalance (Gen 2)
Exposure
  • Luminance
  • Red
  • Green
  • Blue
  • 20 x 900 sec - 5 hours
  • 9 x 600 sec - 90 minutes
  • 9 x 600 sec - 90 minutes
  • 9 x 600 sec - 90 minutes
  • UNBINNED
  • BINNING 2X2
  • BINNING 2X2
  • BINNING 2X2
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - 24 / 25 dec 2017
Seeing About 3 " - 0.71 arcosec/pixel image scale unbinned
Note Session during Christmas Night
Acquisition MaxIm DL - CCD Autopilot 5
Processing Adobe Photoshop CS5 -
Comment

Spiral galaxy about 12 millions light-years far. Ursa Major constellation. Discovered in 1774 by J. H. Bode. Dimension (apparent) 27 x 14 '. Apparent Mag. 6.94 - SN 1993J was detected on 28 march 1993 and it's the only SN known in this galaxy. M81 is the largest galaxy in a 34 galaxies group located in Ursa Major. It has gravitational interactions with M82 and NGC 3077, with intense star dust formation between them. The blue satellite galaxy at 6 o'clock is named Holmberg IX