2MASS 0939-2448

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2MASS 0939-2448
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 09h 39m 35.48s
Declination −24° 48′ 27.9″
Characteristics
Spectral type T8
Apparent magnitude (J) 15.61 ± 0.09
Apparent magnitude (H) 15.96 ± 0.09
Apparent magnitude (K) 16.83 ± 0.09
Astrometry
Proper motion (μ) RA: +573 ± 2 mas/yr
Dec.: −1045 ± 3 mas/yr
Parallax (π) 187.3 ± 4.5 mas
Distance 17.4 ± 0.4 ly
(5.3 ± 0.1 pc)
Details
2MASS 0939-2448 A
Mass 0.02 - 0.05 M
Radius 0.08 - 0.09 R
Temperature 600 - 700 K
Metallicity −0.3
Age 2 – 10 Gyr
2MASS 0939-2448 B
Mass 0.02 - 0.04 M
Radius 0.09 R
Temperature 500 - 600 K
Metallicity −0.3
Other designations
2MASS J09393548-2448279

2MASS 0939-2448 (2MASS J09393548-2448279) is a probable binary system consisting of two brown dwarfs. The object belongs to the spectral class T8, lies in the constellation Antlia and is about 17 light years away from Earth. It was identified as a brown dwarf through analysis of data from the 2MASS survey by Tinney et al. (Publication 2005). Model calculations suggest that it is a system of two brown dwarfs with effective temperatures of about 500 and 700 K and masses of about 25 and 40 Jupiter masses, it is also possible that it is a pair of identical objects with temperatures of 600 K and 30 Jupiter masses.

In 2008, 2MASS 0939-2448 was the dimmest brown dwarf known.[1]

References[edit]

  1. ^ "Astronomers Find the Two Dimmest Stellar Bulbs" (Press release). NASA/JPL. 2008-12-10. Retrieved 2008-12-20. 

External links[edit]

Coordinates: Sky map 09h 39m 35.48s, −24° 48′ 27.9″