2MASS J02431371-2453298
Coordinates: 
02h 43m 13.72s, −24° 53′ 29.8″
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 43m 13.72s[1]:{{{3}}} |
| Declination | −24° 53′ 29.8″[1]:{{{3}}} |
| Characteristics | |
| Spectral type | T6 |
| Apparent magnitude (J) | 15.38 ± 0.05[1]:{{{3}}} |
| Apparent magnitude (H) | 15.137 ± 0.109[1]:{{{3}}} |
| Apparent magnitude (K) | 15.216 ± 0.168[1]:{{{3}}} |
| Astrometry | |
| Proper motion (μ) | RA: -288 ± 4[1]:{{{3}}} mas/yr Dec.: -208 ± 3[1]:{{{3}}} mas/yr |
| Parallax (π) | 93.62 ± 3.63[2]:{{{3}}} mas |
| Distance | 35 ± 1 ly (10.7 ± 0.4 pc) |
| Details | |
| Temperature | 800 – 1300 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
2MASS J02431371-2453298 (abbreviated to 2MASS 0243-2453) is a brown dwarf of spectral class T6,[3]:{{{3}}}[1]:{{{3}}} located in the constellation Fornax about 34.84 light-years from Earth.[2]:{{{3}}}
Contents
Discovery
2MASS 0243-2453 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 0243-2453. 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]:{{{3}}}
Distance
Currently the most precise distance estimate of 2MASS 0243-2453 is published in 2004 by Vrba et al. trigonometric parallax, measured under U.S. Naval Observatory Infrared Astrometry Program: 93.62 ± 3.63 mas, corresponding to a distance 10.68 ± 0.43 pc, or 34.84 ± 1.41 ly.[2]:{{{3}}}
2MASS 0727+1710 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Vrba et al. (2004) | 93.62 ± 3.63 | 10.68 ± 0.43 | 34.84 ± 1.41 | [2]:{{{3}}} |
Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.
Space motion
Position of 2MASS 0243-2453 shifts due to its proper motion by 0.3548 arcseconds per year.
Properties
Surface temperature of 2MASS 0243-2453 is 800-1300 K. As with other brown dwarfs of spectral type T, its spectrum is dominated of methane.
See also
The other 10 brown dwarfs, presented in Burgasser et al. (2002):[3]
- 2MASS 0415-0935 (T8)
- 2MASS 0727+1710 (T7)
- 2MASS 0755+2212 (T5)
- 2MASS 0937+2931 (T6)
- 2MASS 1534-2952 (T5.5)
- 2MASS 1546-3325 (T5.5)
- 2MASS 1553+1532 (T7)
- 2MASS 2254+3123 (T5)
- 2MASS 2339+1352 (T5.5)
- 2MASS 2356-1553 (T6)
