NGC 6440

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NGC 6440
NGC 6440 hst 12517 R814B606.png
The globular cluster NGC 6440
Credit: HST
Observation data (J2000 epoch)
Class V
Constellation Sagittarius
Right ascension 15h 28m 00.69s[1]
Declination −20° 21′ 34.5″[1]
Distance 27.7 kly
(8.5 kpc)[1]
Apparent magnitude (V) 10.10[1]
Physical characteristics
Radius 3.15' x 3.15'[2]
Metallicity  = -0.36[3] dex
Other designations GCl 77, 1FGL J1748.7-2020, MXB 1746-20[1]
See also: Globular cluster, List of globular clusters

NGC 6440 is a globular cluster in the constellation Sagittarius and was discovered by William Herschel on 28 May 1786. It has an apparent magnitude of about 10, with a diameter of about 6 arcminutes, and its Shapley–Sawyer Concentration Class is V.[2]

References[edit]

  1. ^ a b c d e "NGC 6440". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017.
  2. ^ a b "NGC 6440". Retrieved 8 January 2016.
  3. ^ "A Galactic Globular Clusters Database: NGC 6440". Retrieved 8 January 2017.

External links[edit]