2MASS J02431371−2453298
Brown dwarf in the constellation Fornax
From Wikipedia, the free encyclopedia
2MASS J02431371−2453298 (abbreviated to 2MASS 0243−2453) is a brown dwarf of spectral class T6,[4][1] located in the constellation Fornax about 36.6 light-years from Earth.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 43m 13.72s[1] |
| Declination | −24° 53′ 29.8″[1] |
| Characteristics | |
| Spectral type | T6 |
| Apparent magnitude (J) | 15.38 ± 0.05[1] |
| Apparent magnitude (H) | 15.137 ± 0.109[1] |
| Apparent magnitude (K) | 15.216 ± 0.168[1] |
| Astrometry | |
| Proper motion (μ) | RA: −281.34 mas/yr[2] Dec.: −201.55 mas/yr[2] |
| Parallax (π) | 89.07±1.72 mas[2] |
| Distance | 36.6 ± 0.7 ly (11.2 ± 0.2 pc) |
| Details[3] | |
| Mass | 0.024-0.041 M☉ |
| Radius | 0.092-0.106 R☉ |
| Temperature | 800–1300 K |
| Age | 0.4-1.7 billion years |
| Other designations | |
| 2MASSI J0243137−245329[4] 2MASS 2MASS J02431371−24532982[1] 2MASSI J0243−2453[4] 2MASS 2MASS 0243−2453[4] | |
| Database references | |
| SIMBAD | data |
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. These 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 the discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[4]
Distance
Properties
Using an evolutionary model, the surface temperature of 2MASS 0243−2453 is estimated to be 1040–1100 K, and its mass is estimated at 2.4–4.1% that of the Sun, its diameter 0.092 to 0.106 that of the Sun, and age 0.4–1.7 billion years.[3]
As with other brown dwarfs of spectral type T, its spectrum is dominated by methane. Like many other T-class brown dwarfs, 2MASS J0243−2453 does not exhibit any optical variability, indicating its upper atmosphere is free of clouds.[7]
See also
Other brown dwarfs presented in Burgasser et al. (2002):[4]
- 2MASS 0415−0935 (T8)
- 2MASS 0727+1710 (T7)
- 2MASS 0937+2931 (T6)