Astronomy:2MASS 0532+8246
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Coordinates: 
05h 32m 53.46s, +82° 46′ 46.5″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 32m 53.46s[1] |
| Declination | +82° 46′ 46.5″[1] |
| Characteristics | |
| Spectral type | L7[1] |
| Astrometry | |
| Parallax (π) | 40.24 ± 0.64[1] mas |
| Distance | 81 ± 1 ly (24.9 ± 0.4 pc) |
| Details | |
| Mass | 0.077–0.085[citation needed] M☉ |
| Metallicity | 0.1–0.01[2] |
| Age | 10–15[citation needed] Gyr |
| Other designations | |
2MASS J05325346+8246465,[1] 2MASS 0532+8246 | |
| Database references | |
| SIMBAD | data |
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.[3][2] It was discovered from Two Micron All-Sky Survey data, and verified by observations at Palomar Observatory and W. M. Keck Observatory.[2] It has a low metallicity, which indicates it is an old star.[2] With an age of 12.5 billion years, it is the oldest known brown dwarf star.[citation needed]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "2MASS J05325346+8246465 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASS+J05325346%2B8246465&submit=SIMBAD+search. Retrieved 2018-12-04.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 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. et al. (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal 752 (1): 56. doi:10.1088/0004-637X/752/1/56. Bibcode: 2012ApJ...752...56F.
External links
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