XTE J1650-500

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Coordinates: Sky map 16h 50m 00.98s, −49° 57′ 43.6″

XTE J1650-500
XTE J1650-500.jpg
Artist's impression of XTE J1650-500
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension  16h 50m 00.98s[1]
Declination −49° 57′ 43.6″[1]
Spectral type K2V[1]
Black hole
Mass5-10 M
Other designations
Database references

XTE J1650-500 is a binary system containing a stellar-mass black hole candidate and 2000–2001 transient binary X-ray source located in the constellation Ara. In 2008, it was claimed that this black hole had a mass of 3.8±0.5 solar masses,[2] which would have been the smallest found for any black hole; smaller than GRO 1655-40, the then known smallest of 6.3 MSun.[3] However, this claim was subsequently retracted;[4] the more likely mass is 5–10 solar masses.

The binary period of the black hole and its companion is 0.32 days.[5]

See also[edit]


  1. ^ a b c "XTE J1650-500". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. ^ Smallest, lightest black hole identified Technology & science - Space - Space.com By Andrea Thompson, updated 4/1/2008 4:32:08 PM ET
  3. ^ Andrea Thompson (1 April 2008). "Smallest Black Hole Found". Space.com.
  4. ^ Determination of Black Hole Masses in Galactic Black Hole Binaries Using Scaling of Spectral and Variability Characteristics Shaposhnikov, Nickolai; Titarchuk, Lev; The Astrophysical Journal, Volume 699, Issue 1, pp. 453-468 (2009) doi:10.1088/0004-637X/699/1/453 Pdf
  5. ^ Orosz, J.A. et al. (2004) ApJ 616,376-382.