2MASS J02431371−2453298  2MASS J02431371−2453298 (abbreviated to 2MASS 0243−2453) is a brown dwarf of spectral class T6, located in the constellation Fornax about 34.84 light-years from Earth.  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). 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.  2MASS 0727+1710 distance estimates Non-trigonometric distance estimates are marked in "italic". The best estimate is marked in bold. 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 9.2 to 10.6 that of the Sun, and age 0.4–1.7 billion years.