Objects: open cluster NGC 7789
Coordinates (J2000): 23h 57m 24; +56° 43'
Remarks: NGC 7789 is an open cluster in Cassiopeia, it is fairly rich and contains about 300 stars
Telescope and camera: ASA 10", f 3.6, Focal length 900 mm, SBIG St-8300M, 8x Filterwheel
Mount: ASA DDM 85, Software: Autoslew V5.1, Sequence V9
Exposure: RGB each 12 x 5min, total 3 hours
Date and Conditions: August 17, 2012, Engelhardsberg, Germany - stars in the beginning only to 4m5 (misty, conditions not suitable for imaging nebulae), later in the night better, Average FWHM 2,3" (CCDInspector V2.5)
Software used: acquisition: Maxim DL 5, Stacking: DeepSkyStacker 3.3.2, Processing: Adobe Photoshop CS4, PixInsight 1.7