M81 and M82

It’s been a while since I imaged M81 and M82, the famous pair almost made to be photographed.

Messier 81 is the largest galaxy in the M81 Group, M82 the second largest in the group of 34 galaxies located in the constellation Ursa Major, at about  12 Mly. M81 is a spiral, M82 is a starburst galaxy, distorted by the interactions with M81. The intense star formation makes M82, though less massive, more luminous than the Milky Way. The very faint satellite of spiral, in this picture the patch at one o’clock from M81’s core, is the Holmberg IX dwarf, one of the youngest of its kind.

Obvious objects in the frame:

  • M 81, NGC 3031 Bode’s Galaxy 7.3m [wiki]
  • M 82, NGC 3034 Cigar Galaxy 8.9m [wiki]
  • Holmberg IX (UGC 05336, PGC 28757) satellite of M 81, a young dwarf galaxy, 14.5m [wiki] [aladin]

In the meanwhile I have been working on my own image annotating program, which goes beyond astrometry.net’s tool. The first step is still the plate solving done by nova.astrometry.net. From there I obtaine a kmz file containing a morphed image (alpha channeled png) and a kml (like xml) file describing the corners’ coordinates in Earth frameset, so ra=long+180. Then my DSO does a cone search and draws on the gotten image. It does not mean all of these objects are obvious or even visible. But as per position,  they are there.

Here’s that list:

  • M 81, NGC 3031 [galaxy in UMa] Bode’s Galaxy, Bode Galaxisa, Galaxia lui Bode 7.3m [wiki] [simbad]
  • M 82, NGC 3034 [galaxy in UMa] Cigar Galaxy, Szivar-galaxis 8.9m [wiki] [simbad]
  • PGC 28757, UGC 05336 [galaxy in UMa] Holmberg IX  14.48m [simbad]
  • PGC 28731 [galaxy in UMa] 15.66m [simbad]
  • PGC 28505 [galaxy in UMa] 15.71m [simbad]
  • PGC 3086325 [galaxy in UMa] 15.78m [simbad]
  • PGC 28614 [galaxy in UMa] 15.81m [simbad]
  • PGC 28848 [galaxy in UMa] 16.17m [simbad]
  • PGC 2721118 [galaxy in UMa] 16.33m [simbad]
  • PGC 3086268 [galaxy in UMa] 16.36m [simbad]
  • PGC 28759 [galaxy in UMa] 16.8m [simbad]
  • PGC 2733060 [galaxy in UMa] 16.99m [simbad]

 

I used my modded Canon 1100D, 20×90 sec, ISO 3200 attached to the N 150/750 scope, with the MPCC Mark III field corrector on the HEQ5 mount, Dângău Mare, Cluj, 2017-04-01.

raw

raw

one raw curved

one raw curved

stack

stack

generated flat

generated flat

M81 crop – the colors were off

M81 crop – the colors were off

A detour: the supernova SN 2014J in M82

A detour: the supernova SN 2014J in M82

Supernova in M82, january of 2014 (Canon 1100D @ N 150/750, EQ3, unguided)

Supernova in M82, january of 2014 (Canon 1100D @ N 150/750, EQ3, unguided)

Back to present day: platesolved

Back to present day: platesolved

platesolved by astrometry, auto-annotated by myself

platesolved by astrometry, auto-annotated by myself

M81 and M82 – final image

M81 and M82 – final image

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