Messier 14

Messier 14
Messier 14, from 2MASS
Observation data (J2000 epoch)
Class	VIII^[1]
Constellation	Ophiuchus
Right ascension	17^h 37^m 36.15^s^[2]
Declination	–03° 14′ 45.3″^[2]
Distance	30.3 kly (9.3 kpc)^[3]
Apparent magnitude (V)	+8.32^[2]
Apparent dimensions (V)	11.0′
Physical characteristics
Mass	7006104000000000000♠1.04×10⁶^[3] M_☉
Radius	50 ly^[4]
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = –1.28^[3] dex
Other designations	NGC 6402^[2]

Messier 14 (also known as M14 or NGC 6402) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier in 1764.

At a distance of about 30,000 light-years, M14 contains several hundred thousand stars. At an apparent magnitude of +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 total of 70 variable stars are 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.

Messier 14 with amateur telescope

Map showing location of Messier 14

References

↑ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S.
1 2 3 4 "SIMBAD Astronomical Database". Results for NGC 6402. Retrieved 2006-11-15.
1 2 3 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

External links

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

Messier objects

List	M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 M13 M14 M15 M16 M17 M18 M19 M20 M21 M22 M23 M24 M25 M26 M27 M28 M29 M30 M31 M32 M33 M34 M35 M36 M37 M38 M39 M40 M41 M42 M43 M44 M45 M46 M47 M48 M49 M50 M51 M52 M53 M54 M55 M56 M57 M58 M59 M60 M61 M62 M63 M64 M65 M66 M67 M68 M69 M70 M71 M72 M73 M74 M75 M76 M77 M78 M79 M80 M81 M82 M83 M84 M85 M86 M87 M88 M89 M90 M91 M92 M93 M94 M95 M96 M97 M98 M99 M100 M101 M102 M103 M104 M105 M106 M107 M108 M109 M110

See also	Caldwell catalogue Catalogue of Nebulae and Clusters of Stars Herschel 400 Catalogue Index Catalogue New General Catalogue Revised New General Catalogue

Book Category Commons Portal

New General Catalogue 6000 to 6499

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Astronomical catalog List of NGC objects

Coordinates: 17^h 37^m 36.15^s, −03° 14′ 45.3″

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