26 July 2011

Μ 13 Cluster in Hercules(LRGB)

M 13 Cluster in Hercules(LRGB)

  • Telescope: William Optics FLT 11o modified
  • Mount: Skywatcher EQ6 Skyscan Pro with EQMod & EQDir
  • CCD: Qhy2 Pro at -10c
  • Guiding: TS finder 8x50 & Meade DSI 1
  • Luminance : 80min (bin 1x1)
  • RGB : 30min each (all bin 1x1)
  • Total exposure: 180 minutes

 Information about M 13

Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of Hercules.

M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764. It is located at right ascension 16h 41.7m and declination +36° 28'. With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night. Its diameter is about 23 arc minutes and it is readily viewable in small telescopes. Nearby is NGC 6207, a 12th magnitude edge-on galaxy that lies 28 arc minutes directly north east. A small galaxy, IC 4617, lies halfway between NGC 6207 and M13, north-northeast of the large globular cluster's center.

M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth.

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