NGC 6558

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 GCl 89, ESO 456-62, VDBH 259[1]

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.

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

References

  1. 1 2 3 4 5 "NGC 6558". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017.
  2. 1 2 "NGC 6558". Retrieved 8 January 2016.
  3. ↑ "A Galactic Globular Clusters Database: NGC 6558". Retrieved 8 January 2017.
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