2MASS J02431371−2453298

2MASS J02431371−2453298 (abbreviated to 2MASS 0243−2453) is a brown dwarf of spectral class T6,^[3][1] located in the constellation Fornax about 34.84 light-years from Earth.^[4]

2MASS J02431371−2453298

2MASS 0243−2453 Credit: legacy surveys
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: -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] 2MASS 2MASS J02431371−24532982[1] 2MASSI J0243−2453[3] 2MASS 2MASS 0243−2453[3]
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).^[3]

Distance

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]

Space motion

Position of 2MASS 0243-2453 shifts due to its proper motion by 0.3548 arcseconds per year.

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.^[5]

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.^[6]

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)