09h37m34.9s, +29° 31′41″
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h37m 34.9s |
| Declination | 29° 31′ 41″ |
| Characteristics | |
| Spectral type | T6p |
| Astrometry | |
| Proper motion (μ) | RA: 944.15 ± 1.24 mas/yr Dec.: −1319.78 ± 1.21 mas/yr |
| Parallax (π) | 163.39 ± 1.76 mas[1] |
| Distance | 20.0 ± 0.2 ly (6.12 ± 0.07 pc) |
| Details | |
| Mass | 41.56±25.72[2] MJup |
| Radius | 0.94±0.16[2] RJup |
| Luminosity | 0.000005[2] L☉ |
| Surface gravity (log g) | 4.97±0.48[2] cgs |
| Temperature | 881±74[2] K |
| Age | 0.5-10[2] Gyr |
| Other designations | |
2MASS J09373487+2931409 | |
| Database references | |
| SIMBAD | data |
  2MASS 0937+2931 Location of 2MASS 0937+2931 in the constellation Leo | |
2MASS J09373487+2931409, or 2MASSI J0937347+293142 (abbreviated to 2MASS 0937+2931) is a brown dwarfofspectral class T6,[3][4] located in the constellation Leo about 19.96 light-years from Earth.[1]
2MASS 0937+2931 was discovered in 2002 by Adam J. Burgasser et al. from Two Micron All-Sky Survey (2MASS), conducted from 1997 to 2001. Follow-up observations were made in 1998–2001 using the Near-Infrared Camera, mounted on the Palomar 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0937+2931. This 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and this discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[3]
Currently the most precise distance estimate of 2MASS 0937+2931 is trigonometric parallax, published in 2009 by Schilbach et al.: 163.39 ± 1.76 mas, corresponding to a distance 6.12 ± 0.07 pc, or 19.96 ± 0.22 ly.[1] A less precise parallax of this object, measured under U.S. Naval Observatory Infrared Astrometry Program, was published in 2004 by Vrba et al.[5]
2MASS 0937+2931 has an unusual spectrum, indicating a metal-poor atmosphere and/or a high surface gravity (high pressure at the surface).[3] Its effective temperature is estimated at 800 Kelvin. The Research Consortium On Nearby Stars (RECONS) estimates the brown dwarf to be 0.03 solar masses.[6] No optical variability was detected as in 2014.[7]
The other 10 brown dwarfs, presented in Burgasser et al. (2002):[3]
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Italic are systems without known trigonometric parallax. | |||||||||||||||||||||||||||||||||||||||||||
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