Astronomy:NGC 6440
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Short description: Globular cluster in the constellation of Sagittarius
| NGC 6440 | |
|---|---|
 The globular cluster NGC 6440 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Class | V |
| Constellation | Sagittarius |
| Right ascension | 17h 48m 52.7s[1] |
| Declination | −20° 21′ 36.9″[1] |
| Distance | 27.7 kly (8.5 kpc)[2] |
| Apparent magnitude (V) | 10.10[2] |
| Physical characteristics | |
| Radius | 3.15' x 3.15'[1] |
| Metallicity | [math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = -0.36[3] dex |
| Other designations | GCl 77, 1FGL J1748.7-2020, MXB 1746-20[2] |
NGC 6440 is a globular cluster in the constellation Sagittarius discovered by William Herschel on 28 May 1786. It has an apparent magnitude of around 10, with a diameter of about 6 arcminutes, and its Shapley–Sawyer Concentration Class is V.[1]
References
- ↑ 1.0 1.1 1.2 1.3 "NGC 6440". http://spider.seds.org/spider/MWGC/n6440.html.
- ↑ 2.0 2.1 2.2 "NGC 6440". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6440.
- ↑ "A Galactic Globular Clusters Database: NGC 6440". http://gclusters.altervista.org/cluster_4.php?ggc=NGC+6440.
External links
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