Messier 55

Messier 55

Observation data (J2000 epoch)
Class	XI
Constellation	Sagittarius
Right ascension	19^h 39^m 59.40^s^[1]
Declination	-30° 57′ 43.5″^[1]
Distance	17.3 kly^{[citation needed]} (5.3 kpc)
Apparent magnitude (V)	+7.42^[1]
Apparent dimensions (V)	19′.0
Physical characteristics
Mass	kg ( M)
Radius	48 ly^[2]
Other designations	M55, NGC 6809, GCl 113^[1]
See also: Globular cluster, List of globular clusters
v • d • e

Messier 55 (also known as M55 or NGC 6809) is a globular cluster in the constellation Sagittarius. It was discovered by Nicolas Louis de Lacaille in 1751 and catalogued by Charles Messier in 1778. M55 is at a distance of about 17,300 light-years away from Earth. Only about half a dozen variable stars have been discovered in M55.

Messier 55 with amateur telescope

External links

^ ^a ^b ^c ^d "SIMBAD Astronomical Database". Results for NGC 6809. http://simbad.u-strasbg.fr/Simbad. Retrieved 2006-11-16.
^ distance × sin( diameter_angle / 2 ) = 48 ly. radius

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v • d • e Messier objects

List of Messier objects

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: Globular cluster · Constellation · Galaxy · Nebula