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M13 is called the "Great Globular Star Cluster in Hercules", and is considered the most splendid such object in the Northern sky. Edmond Halley (of "Halley's Comet" fame) discovered M13 in 1714. The cluster is visible by the naked eye as a "fuzzy star", but requires a 4 inch scope to resolve individual stars. M13 has a total luminosity of more than 300,000 suns and is about 160 light years across.
Photographic Data:
Telescope:
Celestron 14" SCT
Focal
Ratio: f/11
Focal Length:
3910mm
Film Speed:
ISO 1000
Exposure Time: 15 min
Date:
UTC
Time:
UTC
Location Data:
Latitude:
37° 33'
Longitude:
120° 47'
Astronomical Data:
RA:
16hr 42min
Decl:
36° 27'
Altitude:
65° 48'
Azmuth:
82° 48'
Type:
Globular Cluster
Magnitude:
5.9