Terzan 5

Terzan 5
Hubble image of Terzan 5
Observation data (J2000 epoch)
ClassG2[1]
ConstellationSagittarius
Right ascension17h 48m 05s[2]
Declination−24° 46′ 48″[2]
Distance18.8 ± 1.6 kly[note 1] (5.9 ± 0.5 kpc[4])
Apparent magnitude (V)12.8[1]
Apparent dimensions (V)1′02″ (half-mass diameter)[4]
Physical characteristics
Mass~2×106[4] M☉ (4 × 1036 kg)
Radius2.7 ly[note 2]
VHB22.5[3]
Metallicity = −0.21 dex
Estimated age12 Gyr[6]
Notable featuresPossibly the core of a disrupted dwarf galaxy
Other designationsTer 5, IRC–20385
See also: Globular cluster, List of globular clusters

Terzan 5 is a heavily obscured globular cluster belonging to the bulge (the central star concentration) of the Milky Way galaxy.[3] It was one of six globulars discovered by French[7] astronomer Agop Terzan in 1968[8] and was initially labeled Terzan 11. The cluster was cataloged by the Two-Micron Sky Survey as IRC–20385.[9] It is situated in the Sagittarius constellation in the direction of the Milky Way's center. Terzan 5 probably follows an unknown complicated orbit around the center of the galaxy, but currently it is moving towards the Sun with a speed of around 90 km/s.[6]

  1. ^ a b c Cite error: The named reference Racine1975 was invoked but never defined (see the help page).
  2. ^ a b "Cl Terzan 5". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-12-04.
  3. ^ a b c Cite error: The named reference Ortolani1996 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Lanzoni2010 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Ortolani2007 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Ferraro2009 was invoked but never defined (see the help page).
  7. ^ Gottlieb, Steve (August 1, 2000). "Deep-Sky Notebook: A Tour of Obscure Summer Globular Clusters". Sky and Telescope. 100 (2): 112. ISSN 0037-6604.
  8. ^ Terzan, Agop (1968). "Six nouveaux amas stellaires (Terzan 3-8) dans la region DU centre de la Voie lactee et les constellations DU Scorpion et DU Sagittaire". C. R. Acad. Sci. 267 (Ser. B): 1245–1248. Bibcode:1968CRASB.267.1245T.
  9. ^ Cite error: The named reference King1972 was invoked but never defined (see the help page).


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