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Brown dwarf in the constellation Vela From Wikipedia, the free encyclopedia
DENIS-P J082303.1-491201 (also known as DENIS J082303.1-491201, DE0823-49), is a binary system of two brown dwarfs, located 20.77 parsecs (67.7 ly) from Earth. The system is located in the constellation Vela.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vela |
Right ascension | 08h 23m 03.13s[1] |
Declination | −49° 12′ 01.3″[1] |
Characteristics | |
Spectral type | L1.5 + L5.5[2] |
Apparent magnitude (R) | 20.020[3] |
Astrometry | |
Proper motion (μ) | RA: −154.92[2] mas/yr Dec.: 7.99[2] mas/yr |
Distance | 67.48 ± 0.20 ly (20.69 ± 0.06[2] pc) |
Orbit[4] | |
Period (P) | 247.75 ± 0.64 d |
Semi-major axis (a) | 4.62 ± 0.12 mas″ |
Eccentricity (e) | 0.36 ± 0.04 |
Inclination (i) | 52.2 ± 1.5° |
Longitude of the node (Ω) | 346.2 ± 2.0° |
Periastron epoch (T) | JD 2455927.323928 |
Argument of periastron (ω) (secondary) | 41.8 ± 4.7° |
Details[2] | |
A | |
Mass | 0.028−0.063 M☉ |
Luminosity | 0.00018 L☉ |
Temperature | 2150 ± 100 K |
Age | 80–500 Myr |
B | |
Mass | 0.018−0.045 M☉ |
Luminosity | 0.000063 L☉ |
Temperature | 1670 ± 140 K |
Other designations | |
Database references | |
SIMBAD | data |
The primary has a spectral class of L1.5, a mass of 0.028 to 0.063 M☉ and a temperature of 2,150 K (1,880 °C; 3,410 °F). The secondary is also a brown dwarf but with a spectral type of L5.5, a mass of 0.018 to 0.045 M☉, and a temperature of 1,670 K (1,400 °C; 2,550 °F). The mass ratio is around 0.64 to 0.74.[2]
The system has an orbital period of 248 days. The age of the system is estimated to be around 80 to 500 million years old, a relatively young object in the solar neighbourhood, however it does not seem to have any association with any moving groups.[2]
DENIS J082303.1-491201 was discovered in 2007 by Ngoc Phan-Bao et al as part of the Deep Near Infrared Survey of the Southern Sky or DENIS for short.[5]
A substellar companion, DENIS-P J082303.1−491201 b was discovered in 2013[6] and included in the NASA Exoplanet Archive as the first exoplanet discovered by the Astrometry exoplanet detection method.[7][8]
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