2MASS 0939-2448

2MASS J09393548 - 2448279 is probably a binary system consisting of two brown dwarfs. The object belongs to the spectral class T8, lies in the constellation Hydra and is about 17 light-years away from Earth. It was by Tinney et al. by analyzing the data from the 2MASS survey as a brown dwarf identified (Publication 2005). Model calculations suggest that it is a system of two brown dwarfs with effective temperatures of about 500 and 700 kelvin and masses of 25 and 40 Jupiter masses, but it would also be a couple with temperatures of 600 K and the 30 Jupiter masses possible. The components of the system are assumed to be the coolest known brown dwarfs.

Sources and References

  • Tinney et al.: 'The 2MASS wide-field T dwarf search. IV Hunting out T dwarfs with methane imaging ". ; in: The Astronomical Journal, Vol 130, Issue 5, pp. 2326ff. (2005)
  • . Burgasser et al: " 2MASS J09393548 - 2448279: The Coldest and Least Luminous Brown Dwarf Binary Known? "; In: The Astrophysical Journal, Vol 689, Issue 1, pp. L53 - L56 (2008)
  • . Leggett et al, " The Physical Properties of Four ~ 600 KT Dwarfs "; In: The Astrophysical Journal, Vol 695, Issue 2, pp. 1517ff. (2009)
  • Water snake ( constellation )
  • Brown dwarf of spectral type T
Declination Astrometry Proper motion Minute of arc#Symbols and abbreviations
617
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