M13
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Imaging Equipment:
- Telescope: Celestron C11 at f/6.5
- Zeiss II German Equatorial Mount
- Santa Barbara Instrument Group ST-8E NABG CCD camera (1530 x 1020 pixels, 9 x 9
mm, monochromatic, 16 bit, 13.8 x 9.2mm array)
- CWF8 color filter wheel with IR-blocking clear, red, green and blue dichroic filters
Exposure Information
Date: Friday July 5, 2002
Location: Mt. Pinos, CA
Elevation: 8300', OAT +50F
Composition: RGB
R:G:B = 50:50:60 minutes. Total exposure time: 160 minutes
All subexposures were 5 minutes each
Raw FWHM: 3.1 arc seconds
Plate scale: 1.02 arc-sec/pixel
About Messier 13
Distance from earth: about 25,000 light years
Number of stars: about 1 million
Total luminosity: about 300,000 Suns
Total mass: about 500,000 Suns
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