02h43m13.72s, −24° 53′ 29.8″
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h43m 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: -288 ± 4[1] mas/yr Dec.: -208 ± 3[1] mas/yr |
| Parallax (π) | 93.46 ± 3.49 mas[2] |
| Distance | 35 ± 1 ly (10.7 ± 0.4 pc) |
| Details | |
| 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[3] | |
| Database references | |
| SIMBAD | data |
2MASS J02431371−2453298 (abbreviated to 2MASS 0243−2453) is a brown dwarfofspectral class T6,[3][1] located in the constellation Fornax about 34.84 light-years from Earth.[4]
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).[3]
2MASS J02431371−2453298 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Vrba et al. (2004) | 93.62±3.63 | 10.68±0.41 | 34.84±1.35 | [4] |
| Manjavacas et al. (2018) | 93.46±3.49 | 10.7±0.4 | 34.9±1.3 | [2] |
Position of 2MASS 0243-2453 shifts due to its proper motion by 0.3548 arcseconds per year.
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.[5]
As with other brown dwarfs of spectral type T, its spectrum is dominated of methane. Like mant of other T-class brown dwarf, 2MASS J0243−2453 does not exhibit any optical variability, indicating its upper atmosphere is free of clouds.[6]
The other 10 brown dwarfs, presented in Burgasser et al. (2002):[3]
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