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Kimberton, PA US


Image Details: NGC7789 in Cassiopeia

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NGC7789 in Cassiopeia

Object/Name: NGC7789 Image Details:
Type: Open Cluster (Trumpler type II 2 r) Luminance:0.00 min. (0) – 0.00 min. 1x1
Constellation: Cassiopeia Red:5.00 min. (6) – 30.00 min. 1x1
RA: 23 hours 57 minutes Green:5.00 min. (6) – 30.00 min. 1x1
Dec: +56 degreees 43 minutes Blue:5.00 min. (6) – 30.00 min. 1x1
Distance: 6,000.0 - 7,600.0 light years Total Time:90 minutes
Magnitude: 6.7 mag   
Size: 25.0 x 25.0 arc minutes   
Imaging Dates: 28 December 2006 - 30 November -0001   
Location: Dark Horse Observatory, Kimberton, PA 19460 U.S.A.   
Telescope: Takahashi BRC-250 Mount: Mountain Instruments
CCD: SBIG ST-10XME Rotator: Optec Pxyis Rotator
Focuser: Finger Lakes Instruments DF2 Filters: Astrodon Series E
Software Used:
  CCDStack MiraPro Professional
Photoshop CS2 Russel Croman’s Gradient Xterminator
Noel Carboni’s Astronomy Tools  
Detailed Information:
This is an image of the open star cluster NGC 7789 in the constellation, Cassiopeia that was taken on December 28, 2006 . This open cluster is a less well known than M11 in Scutum. Nonetheless, it is a beautiful example of an open cluster. It lies 3 degrees southwest of Beta Cassiopeia, Caph, the most western star of the famous "W." It is magnitude 6.7 in apparent brightness and has a diameter of 25 arcminutes, which corresponds to a physical size of 44 light-years in diameter. The cluster is about 6,000 light-years distant and contains 583 stars. Something not appreciated in this image is that there multiple complex dark nebulae apparent in wide-field views of the area.

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