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{{Multiple issues|{{external links|date=October 2024}}{{orphan|date=October 2024}}}} | |||
'''NGC 6087''', also referred to as Caldwell 89 or the S Normae Cluster, is an open star cluster consisting of 40 or more stars, located in the constellation Norma. The cluster is centred around the Cepheid variable star, S Normae, and is approximately 3,500 light-years away. It spans nearly a quarter of a degree in the sky, with stars ranging in brightness from magnitude 7 to 11, the brightest being S Normae at magnitude 6.5. The total visual magnitude of the cluster is around 5.4. | '''NGC 6087''', also referred to as Caldwell 89 or the S Normae Cluster, is an open star cluster consisting of 40 or more stars, located in the constellation Norma. The cluster is centred around the Cepheid variable star, S Normae, and is approximately 3,500 light-years away. It spans nearly a quarter of a degree in the sky, with stars ranging in brightness from magnitude 7 to 11, the brightest being S Normae at magnitude 6.5. The total visual magnitude of the cluster is around 5.4. | ||
Spectral analysis of the radial velocities of the stars confirms that S Normae is indeed a member of the cluster. The distance to the cluster can be accurately measured using the period-luminosity relationship of Cepheid variable stars. | Spectral analysis of the radial velocities of the stars confirms that S Normae is indeed a member of the cluster. The distance to the cluster can be accurately measured using the period-luminosity relationship of Cepheid variable stars.{{Citation-needed}} | ||
== | ==References== | ||
* [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6087 "NGC 6087"] | * [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6087 "NGC 6087"] | ||
* [https://doi.org/10.1086%2F190092 "The Galactic Cluster NGC 6087"] | * [https://doi.org/10.1086%2F190092 "The Galactic Cluster NGC 6087"] | ||