NGC 6558 explained

NGC 6558
Class:	V
Epoch:	J2000
Constellation:	Sagittarius
Ra:	^[1]
Dist Ly:	24.1 kly (7.4 kpc)
Appmag V:	11.29
Radius Arcminsec:	5.2' x 5.2'^[2]
Metal Fe:	-1.32^[3]
Names:	Cr 368, GCl 89, ESO 456-62, VDBH 259

NGC 6558 is a globular cluster, located about 24,000^[4] 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.

It is located 1.5 degrees south-southeast of Gamma² Sagittarii.

References

Notes

External links

• • NGC 6558

Notes and References

1. NGC 6558. 8 January 2017.
2. Web site: NGC 6558. 8 January 2016.
3. Web site: A Galactic Globular Clusters Database: NGC 6558. 8 January 2017.
4. 2407.15918 . Souza . S. O. . Libralato . M. . Nardiello . D. . Kerber . L. O. . Ortolani . S. . Pérez-Villegas . A. . Oliveira . R. A. P. . Barbuy . B. . Bica . E. . Griggio . M. . Dias . B. . Combined Gemini-South and HST photometric analysis of the globular cluster NGC 6558. The age of the metal-poor population of the Galactic Bulge . 2024 . astro-ph.GA . In the literature, the heliocentric distance of NGC 6558 ranges from ∼6.3 kpc (Rich et al. 1998) to ∼8.3 kpc (Barbuy et al. 2018b)..