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     Messier 37
         Open Cluster in Auriga
      RA:05h 52m 18s  Dec: +32 33' 02"
       Distance - ~4.500ly  Size- 10-13ly


Click on image for larger size
Location & Date
Backyard, Abbott Observatory- Long Island, NY,  Jan. 20,21 2021
Telescope
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Camera
SBIG ST-10XME
Baader  R G B  filters
CCD temp -15C
Exposures
Red-15 x 2m  Green-15x2m  Blue-15x2m  Bin 1x1 per each mosaic panel
Planning & Acquisition
Mosaic planning - Sequence Generator Pro Mosaic Tool
Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
Processing
CCDStack - calibration, debloom
Astro Pixel Processing -  Normalize, Alignment, Combine, mosaic stitching
Adobe CS4 -  Color Image composition, star glows, Noise reduction, JPEG conversion

This is a 4 panel RGB mosaic
From Wikipedia;
 
  Messier 37 (also known as M37 or NGC 2099) is the brightest and richest open cluster in the constellation Auriga. It was discovered by the Italian astronomer Giovanni Battista Hodierna before 1654. M37 was missed by French astronomer Guillaume Le Gentil when he rediscovered M36 and M38 in 1749. French astronomer Charles Messier independently rediscovered M37 in September 1764 but all three of these clusters were recorded by Hodierna. It is classified as Trumpler type I,1,r or I,2,r.

  M37 exists in the antipodal direction, opposite from the Galactic Center as seen from Earth, so is in one of the nearby outer arms. Specifically it is still close enough to be in our own. Estimates of its age range from 347 million to 550 million years. It has 1,500 times the mass of the Sun and contains over 500 identified stars, with roughly 150 stars brighter than magnitude 12.5. M37 has at least a dozen red giants and its hottest surviving main sequence star is of stellar classification B9 V. The abundance of elements other than hydrogen and helium, what astronomers term metallicity, is similar to, if not slightly higher than, the abundance in the Sun.