2MASS 0532+8246

Coordinates: 05h 32m 53.46s, +82° 46′ 46.5″

2MASS J05325346+8246465
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Camelopardalis
Right ascension 05h 32m 53.46s[1]
Declination +82° 46′ 46.5″[1]
Characteristics
Spectral type sdL7[1]
Astrometry
Parallax (π)37.50 ± 1.70[2] mas
Distance87 ± 4 ly
(27 ± 1 pc)
Details
Mass0.077–0.085 M☉
Metallicity0.1– 0.01[3]
Age10–15 Gyr
Other designations
2MASS J05325346+8246465,[1]
2MASS 0532+8246
Database references
SIMBADdata

2MASS 0532+8246 (full designation 2MASS J05325346+8246465) is possibly the first brown dwarf observed in the galactic halo of the Milky Way, and the first known substellar subdwarf star.[2][3] It was discovered from Two Micron All-Sky Survey data, and verified by observations at Palomar Observatory and W. M. Keck Observatory.[3] It has a low metallicity, which indicates it is an old star.[3] With an age of 12.5 billion years, it is the oldest known brown dwarf star.

References

  1. 1 2 3 4 5 6 "2MASS J05325346+8246465 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-11-23.
  2. 1 2 Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv:1203.5543. Bibcode:2012ApJ...752...56F. doi:10.1088/0004-637X/752/1/56.
  3. 1 2 3 4 Burgasser, Adam J. et al. (2003) The First Substellar Subdwarf? Discovery of a Metal-Poor L Dwarf with Halo Kinematics. The Astrophysical Journal, 592(2) 1186.



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