NGC 6558
| NGC 6558 | |
|---|---|
 The globular cluster NGC 6558 imaged by theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Class | V |
| Constellation | Sagittarius |
| Right ascension | 18h10m18.38s[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 | = -1.32[3]dex |
| Other designations | Cr368, GCl 89, ESO 456-62, VDBH 259[1] |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
NGC 6558is aglobular cluster,located about 24,000light yearsaway in theconstellationSagittarius.Itsapparent magnitudeis about 11 and its apparent diameter is about 10 arcminutes.[2]The globular cluster was discovered in 1784 by the astronomerWilliam Herschelwith his 18.7-inch telescope and the discovery was later catalogued in theNew General Catalogue.
It is located 1.5 degrees south-southeast ofGamma2Sagittarii.
References
[edit]- ^abcde"NGC 6558".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved8 January2017.
- ^ab"NGC 6558".Retrieved8 January2016.
- ^"A Galactic Globular Clusters Database: NGC 6558".Retrieved8 January2017.
External links
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