| NGC 6558 | |
|---|---|
 The globular cluster NGC 6558 imaged by theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Class | V |
| Constellation | Sagittarius |
| Right ascension | 18h 10m 18.38s[1] |
| Declination | −31° 45′ 48.6″[1] |
| Distance | 24.1kly (7.4kpc)[1] |
| Apparent magnitude (V) | 11.29[1] |
| Physical characteristics | |
| Radius | 5.2' x 5.2'[2] |
| Metallicity | [Fe/H] = -1.32[3]dex |
| Other designations | Cr 368, GCl 89, ESO 456-62, VDBH 259[1] |
| See also:Globular cluster,List of globular clusters | |
NGC 6558 is aglobular cluster, located about 24,000[4][a]light years away in theconstellationSagittarius. Itsapparent magnitude is about 11 and its apparent diameter is about 10 arcminutes.[2] The globular cluster was discovered in 1784 by the astronomerWilliam Herschel with his 18.7-inch telescope and the discovery was later catalogued in theNew General Catalogue.
It is located 1.5 degrees south-southeast ofGamma2 Sagittarii.
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).
 | This star cluster–related article is astub. You can help Wikipedia byexpanding it. |
