Open Cluster NGC 7789:  This is one of the oldest Open Clusters of our galaxy. Its age is estaimated to be 1.6 billion years.This is probably due to the fact that it contains approx. 1000 stars, so the gravitational force could hold them together for such a long time.

Object Open Cluster NGC 7789
Category Open Clusters
Designation NGC 7789
Constellation Cassiopeia
Optics Vixen R200SS 8 inch f/4.6 with Televue SBIG Paracorr
Mount Takahashi EM-11
Camera SBIG STL 11000M with internal CFW 5
Exposure 4x2 min (1x1 bin) each Astrodon True Balance RGB filterset, Maxim DL for image acquisition
Calibration Dark + Flat Frame
Guiding Meade DSI Pro II and TMB 80 as Guide Scope, Maxim DL as guiding software
Processing Maxim DL5, Photoshop. Color Code RGB
Location-Date Eningen, Germany - 31 Aug 2009
 
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