Messier 14, from 2MASS
|Observation data (J2000 epoch)|
|Right ascension||17h 37m 36.15s|
|Declination||–03° 14′ 45.3″|
|Distance||30.3 kly (9.3 kpc)|
|Apparent magnitude (V)||+8.32|
|Apparent dimensions (V)||11.0′|
|Other designations||NGC 6402|
|See also: Globular cluster, List of globular clusters|
At a distance of about 30,000 light-years, M14 contains several hundreds of thousands of stars. At an apparent magnitude +7.6 it can be easily observed with binoculars. Medium-sized telescopes will show some hint of the individual stars of which the brightest is of magnitude +14.
The total luminosity of M14 is in the order of 400,000 times that of the Sun corresponding to an absolute magnitude of -9.12. The shape of the cluster is decidedly elongated. M14 is about 100 light-years across.
A respectable total of 70 variable stars is known in M14, many of the W Virginis variety common in globular clusters. In 1938, a nova appeared although this was not discovered until photographic plates from that time were studied in 1964. It is estimated that the nova reached a maximum brightness of magnitude +9.2, over five times brighter than the brightest 'normal' star in the cluster.
Slightly over 3° southwest of M14 lies the faint globular cluster NGC 6366.
- Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S.
- "SIMBAD Astronomical Database". Results for NGC 6402. Retrieved 2006-11-15.
- Boyles, J. et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal 742 (1): 51, arXiv:1108.4402, Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51.
- distance × sin( diameter_angle / 2 ) = 50 ly radius
|Wikimedia Commons has media related to Messier 14.|
- SEDS Messier pages on M14
- M14, Galactic Globular Clusters Database page
- Messier 14 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images