NGC 6558
NGC 6558 is a globular cluster, located about 24,000 light years away in the constellation Sagittarius. Its apparent magnitude is about 11 and its apparent diameter is about 10 arcminutes.[2] The globular cluster was discovered in 1784 by the astronomer William Herschel with his 18.7-inch telescope and the discovery was later catalogued in the New General Catalogue.
NGC 6558 | |
---|---|
The globular cluster NGC 6558 Credit: HST | |
Observation data (J2000 epoch) | |
Class | V |
Constellation | Sagittarius |
Right ascension | 18h 10m 18.38s[1] |
Declination | −31° 45′ 48.6″[1] |
Distance | 24.1 kly (7.4 kpc)[1] |
Apparent magnitude (V) | 11.29[1] |
Physical characteristics | |
Radius | 5.2' x 5.2'[2] |
Metallicity | = -1.32[3] dex |
Other designations | Cr 368, GCl 89, ESO 456-62, VDBH 259[1] |
It is located 1.5 degrees south-southeast of Gamma2 Sagittarii.
References
- "NGC 6558". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017.
- "NGC 6558". Retrieved 8 January 2016.
- "A Galactic Globular Clusters Database: NGC 6558". Retrieved 8 January 2017.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.