The Double Cluster in Perseus

The Double Cluster in Perseus by Peter Longden

The Double Cluster in Perseus by Peter Longden

Peter R Longden

Weston Turville, Buckinghamshire

Telescope: Altair Wave Series 115 F7 ED Triplet APO
Mount: SkyWatcher NEQ6 (on pier)
Auto guiding: SX Lodestar X2, PHD2
Camera: Trius SX 694 monochrome CCD Camera
Filters: SX filter wheel with Baader 1.25†LRGB filters
Focal reducer: Altair PlanoStar 0.79x field reducer/flattener
Focuser: Lakeside Astro motorised focuser
Exposures: R = 10 x 30s, G = 10 x 30s, B = 10 x 30s
Total integration time = 15 minutes
Software: Sequence Generator Pro, PHD2
Image Processing: PixInsight 1.8

NGC 869 and NGC 884 – The Double Cluster in Perseus. Two of the finest examples of open clusters, they rank among the most beautiful sights in the stellar sky. In this image NGC 869 is top left and NGC 884 is bottom right. The clusters are only a few hundred light-years apart, at a distance of over 7000 light-years. Both clusters have been known since antiquity.