Messier 23
Coordinates: 
17h 56m 48s, −19° 01′ 00″
17h 56m 48s, −19° 01′ 00″| Associations | |
|---|---|
| Constellation | Sagittarius |
Messier 23, also known as NGC 6494, is an
occulted by the moon.[8]
The cluster is centered about 2,050
light years away. Estimates for the number of its members range from 169[9] up to 414, with a directly-counted mass of 1,206 M☉; 1,332 M☉ by application of the virial theorem.[4] The cluster is around 330 million years old with a near-solar metallicity of [Fe/H] = −0.04.[5] The brightest component (lucida) is of magnitude 9.3.[10] Five of the cluster members are candidate red giants,[11] while orange variable VV Sgr in the far south,[b] is a candidate asymptotic giant branch star.[12]
A 6th-magnitude star, shown in the top-right corner, figures in the far north-west as a foreground star – HD 163245 (HR 6679). Its
mas, having taken into account proper motion, which means it is about 101 parsecs (330 ly) away.[13]
Gallery
-
Map showing the location of M23
See also
- List of Messier objects
Footnotes and References
Footnotes
References
- S2CID 6066790.
- ^ S2CID 9079873.
- ^ ISBN 978-0596526856
- ^ Bibcode:1983A&A...118..361M.
- ^ S2CID 118382876.
- ^ "M 23". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 12, 2018.
- ISBN 978-1852334741.
- doi:10.1086/112414. See VV Sgr.
- Bibcode:1980A&A....88..102S.
- Bibcode:1990A&AS...84..615S.
- doi:10.1086/165012.
- .
External links
Wikimedia Commons has media related to Messier 23.
- Messier 23, SEDS Messier pages
- Messier 23 on
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