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Odds n Ends

           Messier 100     
       Spiral Galaxy in Coma Berenices
      RA:12h 24m 13s  Dec: +15° 19' 50" Distance - ~55 million ly  Size ~107,000 ly

Click on image for larger size
Location & Date
Backyard, Abbott Observatory- Long Island, NY,  March 2022
Orion ED80 F/7 APO, Moonlite focuser, iOptron GEM45G, Pegasus Falcon rotator
Image scale 2.54 arcsec/pixel
Baader  L R G B  filters
CCD temp -15°C
  L- 12 x 5m  Red- 12 x 5m  Green - 12 x 5m  Blue- 12 x 5m   Bin 1x1  per panel
Planning & Acquisition
Image planning - Sequence Generator Pro Mosaic Planning
Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
CCDStack -  Calibration, Normalize, Alignment,  Deconvolution
Adobe PS -  LRGB combine, Color adjustments, Noise reduction, Sharpen, JPEG conversion
RC-Astro Star XTerminator
Topaz Gigapixel AI - galaxy details


   Messier 100 (also known as NGC 4321) is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices. It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years from our galaxy, its diameter being 107,000 light years, and being about 60% as large. It was discovered by Pierre Méchain in 1781 and 29 days later seen again and entered by Charles Messier in his catalogue "of nebulae and star clusters". It was one of the first spiral galaxies to be discovered, and was listed as one of fourteen spiral nebulae by Lord William Parsons of Rosse in 1850. NGC 4323 and NGC 4328 are satellite galaxies of M100; the former is connected with it by a bridge of luminous matter.

1 hour DDP stretched w/deconvolution, Luminance exposure. This face on galaxy resolves very well even with an 80mm OTA.
You can easily make out all of the fainter galaxies in the background.