NGC 6553

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NGC 6553
NGC 6553 Hubble WikiSky.jpg
The globular cluster NGC 6553
Credit: HST
Observation data (J2000 epoch)
Class V
Constellation Sagittarius
Right ascension 18h 09m 15.68s[1]
Declination −25° 54′ 27.9″[1]
Distance 19.6 kly
(6.01 kpc)[1]
Apparent magnitude (V) 8.06[2]
Physical characteristics
Radius 4.1' x 4.1'[2]
Metallicity  = -0.18[3] dex
Other designations GCl 88, C 1806-259[1]
See also: Globular cluster, List of globular clusters

NGC 6553 is a globular cluster in the constellation Sagittarius. NGC 6553 has an apparent magnitude of about 8 magnitudes with an apparent diameter of 8.2 arcminutes.[2] Its Shapley–Sawyer Concentration Class is XI,[2] meaning the star concentration is very loose even at the center; it has stars of magnitude 20 and dimmer. It is located just over a degree southeast of Messier 8, the Lagoon Nebula.

References[edit]

  1. ^ a b c d "NGC 6553". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017. 
  2. ^ a b c d "NGC 6553". Retrieved 8 January 2016. 
  3. ^ "A Galactic Globular Clusters Database: NGC 6553". Retrieved 8 January 2017. 

External links[edit]