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NGC 869 and NGC 884, also known as The Double Cluster, are two bright open clusters in the constellation Perseus. The Double Cluster is often imaged, but not always with its rich Hydrogen Alpha background! We spent 20 hours on the HA only, and 2.5 hours on RGB for this target, and the result is incredible.


This dataset was acquired from our refractor telescope at Utah Desert Remote Observatories, under exceptionally dark skies. It amounts to 22.5 hours of integration time.


Equipment used:

  • Telescope: Stellarvue SVX130
  • Camera: 61 MegaPixel QHY600M
  • Mount: 10Micron GM1000HPS
  • Filters: 3nm Chroma


We used 4 filters for this object, so you will receive the master files for:

  1. Hydrogen Alpha
  2. Red
  3. Green
  4. Blue


We recommend stacking the RGB data like you would with any cluster, and then use the HA as a background.

The Double Cluster - NGC869/NGC884 - Practice Data

  • Monochrome