© 2021 Michael A. Siniscalchi


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Odds n Ends

                               Messiers 81 & 82
                                       Galaxies in Ursa Major
M81 RA: 09h 55m 32s  Dec: +69° 03' 55"  Distance - 12 mly  Size - 90000 ly
M82 RA: 09h 55m 52s  Dec: +69° 40' 47"  Distance - 12 mly  Size - 37000 ly

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Location & Date
Backyard, Abbott Observatory- Long Island, NY,  Dec, 2020
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Baader  Ha,R,G,B filters
CCD temp -15°C
Ha-8x15M Red-20x10m  Green-20x10m Blue-20x10m Bin 1x1  for each 2 mosaic panel
Planning & Acquisition
Image planning - Sequence Generator Pro mosaic tool. This is a two panel mosaic.
Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
CCDStack - calibration, debloom, deconvolution
Astro Pixel Processor - align, normalize, combine, stitch mosaic panels
Adobe Photoshop - Ha blending into Lum channels, Ha+RGB Image color composition, Noise reduction, JPEG conversion
Topaz Sharpen AI and Gigapixel AI - finer detail processing

From Wikipedia

  Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away, with a diameter of 90,000 light years, in the constellation Ursa Major.
Directly above M81 is Holmberg IX which is a dwarf irregular galaxy. The galaxy is named after Erik Holmberg who first described it. Based on the observed age distribution of stars it contains it is thought to have formed within the last 200 Myr making it the youngest nearby galaxy.
  M82 was first discovered by Johann Elert Bode on 31 December 1774 together with M81. He described it as a "nebulous patch", about 0.75 deg away from M81 and "very pale and of elongated shape".  In 1779, Pierre Méchain independently rediscovered both galaxies and reported them to Charles Messier, who added them to his catalog. Messier 82 (also known as NGC 3034, Cigar Galaxy or M82) is a starburst galaxy approximately 12 million light-years away in the constellation Ursa Major. A member of the M81 Group, it is about five times more luminous than the whole Milky Way and has a center one hundred times more luminous than our galaxy's center.
M82 is being physically affected by its larger neighbor, the spiral M81. Tidal forces caused by gravity have deformed M82, a process that started about 100 million years ago. This interaction has caused star formation to increase tenfold compared to "normal" galaxies.

M81 in Hydrogen Alpha (Ha) initial stretch
M82 in Hydrogen Alpha (Ha) initial stretch prior to deconvolution processing