NGC 6440

Summary

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]

NGC 6440
The globular cluster NGC 6440 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ClassV
ConstellationSagittarius
Right ascension17h 48m 52.7s[1]
Declination−20° 21′ 36.9″[1]
Distance27.7 kly
(8.5 kpc)[2]
Apparent magnitude (V)10.10[2]
Physical characteristics
Radius3.15' x 3.15'[1]
Metallicity = -0.36[3] dex
Other designationsGCl 77, 1FGL J1748.7-2020, MXB 1746-20[2]
See also: Globular cluster, List of globular clusters

References edit

  1. ^ a b c d "NGC 6440". Retrieved 19 December 2019.
  2. ^ a b c "NGC 6440". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017.
  3. ^ "A Galactic Globular Clusters Database: NGC 6440". Retrieved 8 January 2017.

External links edit

  •   Media related to NGC 6440 at Wikimedia Commons
  • NGC 6440