M13
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- 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 9mm, 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