The Double Cluster NGC 884 and NGC 869

These two open star clusters in close proximity, known as the Double Cluster, make a serene view. The right cluster is catalogued as NGC 884, and the left as NGC 869. They are about 7500 light year away, but separated from each other by only a few hundred light-years. Each cluster has about 300 blue-white super-giant stars, and the whole star field is speckled with a handful of beautiful orange stars.

This is, relatively speaking, a bright target. It’s visible to the unaided eye in dark sky areas and easily visible with binoculars. It was therefore an appropriate target for a night with a 90%-illuminated moon, and a sky filled with firework smoke!


  • 62× 120-s light frames (Gain 900)
  • Full use of calibration frames (darks, flats and dark flats)


  • Explore Scientific ED 102 mm Apo f/7 refractor
  • Sky-Watcher EQ6-R PRO SynScan GOTO equatorial mount
  • Altair Hypercam 294C PRO colour fan-cooled camera
  • Revelation Adjustable Field Flattener
  • Altair 60mm guide scope
  • Altair GPCAM2 AR0130 mono guide camera


  • Sharpcap
  • PHD2
  • DeepSkyStacker
  • Photoshop
  • Topaz Labs DeNoise AI

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