Epoch J2000 Equinox J2000
|Right ascension||02h 43m 13.72s|
|Declination||−24° 53′ 29.8″|
|Apparent magnitude (J)||15.38 ± 0.05|
|Apparent magnitude (H)||15.137 ± 0.109|
|Apparent magnitude (K)||15.216 ± 0.168|
|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)
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).
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|
|Manjavacas et al. (2018)||93.46±3.49||10.7±0.4||34.9±1.3|
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.
As with other brown dwarfs of spectral type T, its spectrum is dominated of methane. Like mant of other T-class brown dwarf, 2MASS J02431371−2453298 do not exhibit any optical variability, indicating its upper atmosphere is free of clouds.
- "2MASS J02431371-2453298 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-11-26.
- CLOUD ATLAS: HUBBLE SPACE TELESCOPE NEAR-INFRARED SPECTRAL LIBRARY OF BROWN DWARFS, PLANETARY-MASS COMPANIONS, AND HOT JUPITERS, 2018, arXiv:1812.03963
- 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/0108452. Bibcode:2002ApJ...564..421B. doi:10.1086/324033. S2CID 9273465.
- 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/0402272. Bibcode:2004AJ....127.2948V. doi:10.1086/383554. S2CID 16344176.
- Burgasser AJ, Burrows A, Kirkpatrick JD (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.
- STRONG BRIGHTNESS VARIATIONS SIGNAL CLOUDY-TO-CLEAR TRANSITION OF BROWN DWARFS, 2014, arXiv:1404.3247