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Object: M 13 - Hercules Globular Cluster
Imager: Dipl.-Ing. Johannes Huwe
Date & Location: 4. april 2002, downtown Hannover, Germany
Optics / Telescope: Celestron C11 SCT, SBIG ST10E
Focal length f/ratio: 2800 mm @ f10 (no guiding)
Exposure: 112 sec total, LRGB
L = 40 (4x10) sec, binning 2x2
R = 20 (2x10) sec, binning 3x3
G = 20 (2x10) sec, binning 3x3
B = 32 (2x16) sec, binning 3x3
Software: Processed with CCDSoft, MaxIm DL, Photoshop
Comments: First Light with my C11 and 5th object at all
This photo is taken without an extra focuser. I had really problems to get in focus due to image shifting of the SC.
Conditions: Seeing pretty poor, fst 4.5 mag.
Object Info: M13 is one of the most prominent and best known globulars of the Northern celestial hemisphere. At its distance of 25,100 light years, ists angular diameter of 23' corresponds to 165 light years. M13 contains several 100,000 stars. Visual brightness is 5.8 (mag).

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