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2MASS J02431371−2453298
	; 2MASS 0243−2453; Credit: legacy surveys
Observation data; Epoch J2000 Equinox J2000
Constellation	Fornax
Right ascension	02h 43m 13.72s
Declination	−24° 53′ 29.8″
Characteristics
Spectral type	T6
Apparent magnitude (J)	15.38 ± 0.05
Apparent magnitude (H)	15.137 ± 0.109
Apparent magnitude (K)	15.216 ± 0.168
Astrometry
Proper motion (μ)	RA: -288 ± 4 mas/yr ; Dec.: -208 ± 3 mas/yr
Parallax (π)	93.46 ± 3.49 mas
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; 2MASS 2MASS J02431371−24532982; 2MASSI J0243−2453; 2MASS 2MASS 0243−2453
Database references
SIMBAD	data

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]

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 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]

References

^ ^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.
^ ^a ^b Manjavacas, Elena; Apai, Dániel; Zhou, Yifan; Lew, Ben W. P.; Schneider, Glenn; Metchev, Stan; Miles-Páez, Paulo A.; Radigan, Jacqueline; Marley, Mark S.; Cowan, Nicolas; Karalidi, Theodora; Burgasser, Adam J.; Bedin, Luigi R.; Lowrance, Patrick J.; Kauffmann, Parker (2018), "Cloud Atlas: Hubble Space Telescope Near-infrared Spectral Library of Brown Dwarfs, Planetary-mass Companions, and Hot Jupiters", The Astronomical Journal, 157 (3): 101, arXiv:1812.03963, doi:10.3847/1538-3881/aaf88f, S2CID 119186504
^ ^a ^b ^c ^d ^e ^f Burgasser, Adam J.; Kirkpatrick, J. Davy; Brown, Michael E.; Reid, I. Neill; Burrows, Adam; Liebert, James; Matthews, Keith; Gizis, John E.; Dahn, Conard C.; Monet, David G.; Cutri, Roc M.; Skrutskie, Michael F. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal. 564 (1): 421–451. arXiv:astro-ph/0108452. Bibcode:2002ApJ...564..421B. doi:10.1086/324033. S2CID 9273465.
^ ^a ^b Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, Adam 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/0402272. Bibcode:2004AJ....127.2948V. doi:10.1086/383554. S2CID 16344176.
^ Burgasser, Adam J.; Burrows, Adam; Kirkpatrick, J. Davy (2006). "Method for Determining the Physical Properties of the Coldest Known Brown Dwarfs". The Astrophysical Journal. 639 (2): 1095–1113. arXiv:astro-ph/0510707. Bibcode:2006ApJ...639.1095B. doi:10.1086/499344. S2CID 9291848.
^ Radigan, Jacqueline; Lafrenière, David; Jayawardhana, Ray; Artigau, Étienne (2014), "Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs", The Astrophysical Journal, 793 (2): 75, arXiv:1404.3247, Bibcode:2014ApJ...793...75R, doi:10.1088/0004-637X/793/2/75, S2CID 118357522