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     NGC 869 and NGC 884
         Double Cluster in Perseus
      RA:02h 20m 18s  Dec: +57 08' 02"
       Distance - ~7500ly  Size- 60'


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Click on image for larger size
Location & Date
Backyard, Abbott Observatory- Long Island, NY,  Nov. & Dec. 2020
Telescope
TMB130SS F/7 APO, Moonlite focuser, Losmandy G11 Gemini
Image scale 1.54 arcsec/pixel
Camera
SBIG ST-10XME
Baader  Ha R G B  filters
CCD temp -15C
Exposures
Ha 12x10m  Red-152x 5m  Green-12x5m  Blue-12x5m  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, Noise reduction, JPEG conversion

This is a 4 panel (Ha+R)GB mosaic. A separate channel of Hydrogen Alpha was blended into the red channel to highlight the often overlooked Hydrogen cloud area.
  The Double Cluster is located in the constellation of Perseus and consists of two open clusters, NGC 869 and NGC 884. The clusters are separated from each other by 100's of light years and are at a distance from us of approximately 7,500 light years. The clusters are relatively young with both being 12.8 million years old. Located within each cluster are 300 blue-white super-giant stars. The clusters are also blue shifted, with NGC 869 and NGC884 approaching us at a speed of 24 miles/sec.