2MASS J02431371-2453298

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Coordinates: Sky map 02h 43m 13.72s, −24° 53′ 29.8″

2MASS J02431371-2453298
Observation data
Epoch J2000      Equinox J2000
Constellation Fornax
Right ascension 02h 43m 13.72s[1]
Declination −24° 53′ 29.8″[1]
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]
Proper motion (μ) RA: -288 ± 4[1] mas/yr
Dec.: -208 ± 3[1] mas/yr
Parallax (π) 93.62 ± 3.63[2] mas
Distance 35 ± 1 ly
(10.7 ± 0.4 pc)
Temperature 800 – 1300 K
Other designations
2MASSI J0243137-245329[3]
2MASS 2MASS J02431371-24532982[1]
2MASSI J0243-2453[3]
2MASS 2MASS 0243-2453[3]
Database references

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.[2]


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]


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]

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]

Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.

Space motion[edit]

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


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[edit]

The other 10 brown dwarfs, presented in Burgasser et al. (2002):[3]


  1. ^ a b c d e f g h i "2MASS J02431371-2453298 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-11-26. 
  2. ^ a b c d Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, A. J.; Kirkpatrick, J. Davy; Fan, X.; Geballe, T. R.; Golimowski, D. A.; Knapp, G. R.; Leggett, S. K.; Schneider, D. P.; Brinkmann, J. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astronomical Journal. 127 (5): 2948–2968. arXiv:astro-ph/0402272free to read. Bibcode:2004AJ....127.2948V. doi:10.1086/383554. 
  3. ^ a b c d e f Burgasser, A. J.; Kirkpatrick, J. D.; Brown, M. E.; Reid, I. N.; Burrows, A.; Liebert, J.; Matthews, K.; Gizis, J. E.; Dahn, C. C.; Monet, D. G.; Cutri, R. M.; Skrutskie, M. F. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal. 564 (1): 421–451. arXiv:astro-ph/0108452free to read. Bibcode:2002ApJ...564..421B. doi:10.1086/324033. 

External links[edit]