Astronomy:NGC 6638
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Short description: Globular cluster in the constellation Sagittarius
| NGC 6638 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Class | VI |
| Constellation | Sagittarius |
| Right ascension | 18h 30m 56.2s |
| Declination | −25° 29′ 45″ |
| Distance | 31.3 ± 1.6 kly (9.6 ± 0.5 kpc)[1] |
| Apparent magnitude (V) | 9.5 |
| Apparent dimensions (V) | 2′ |
| Physical characteristics | |
| Mass | 1.89×105[1] M☉ |
| Other designations | GCl 95, C 1827-255[2] |
NGC 6638 is a globular cluster in the constellation Sagittarius. It is magnitude 9.5 and diameter 2 arc minutes, class VI. It is a half degree east of Lambda Sagittarii. It is a member of the Milky Way.[3]
The globular cluster was discovered in 1784 by the astronomer William Herschel with his 18.7-inch telescope and the discovery was later entered in the New General Catalogue.
References
- ↑ 1.0 1.1 Oliveira, R. A. P.; Ortolani, S.; Barbuy, B.; Kerber, L. O.; Maia, F. F. S.; Bica, E.; Cassisi, S.; Souza, S. O. et al. (2022). "Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters". Astronomy & Astrophysics 657: A123. doi:10.1051/0004-6361/202141596. Bibcode: 2022A&A...657A.123O.
- ↑ "NGC 6638". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6638.
- ↑ Harris, W.E. (1996). "A Catalog of Parameters for Globular Clusters in the Milky Way". The Astronomical Journal 112: 1487. doi:10.1086/118116. Bibcode: 1996AJ....112.1487H. http://physwww.physics.mcmaster.ca/%7Eharris/mwgc.dat.
- Robert Burnham, Jr, Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system, vol 3, p. 1557
External links
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