DENIS J082303.1−491201

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.

DENIS J082303.1−491201

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
2MASS J08230313-4912012[3]
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]

Planetary system

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]