ChaHα8

ChaHα8 (also written ChaHa8 when Greek letters are unavailable) is a binary brown dwarf about 640 light-years (200 parsecs) from Earth in the constellation Chamaeleon. The designation indicates that it is in the Chamaeleon I star-forming region and that it displays hydrogen-alpha emission. It was discovered in 2000.^[5]

ChaHα8

ChaHα8 with the Spitzer Space Telescope
Observation data Epoch J2000      Equinox J2000
Constellation	Chamaeleon
Right ascension	11h 07m 46.091s[1]
Declination	−77° 40′ 08.92″[1]
Apparent magnitude (V)	20.1[2]
Characteristics
Spectral type	M5.75–M6.5[3]
Astrometry
Proper motion (μ)	RA: -23.455 mas/yr[1] Dec.: 0.453 mas/yr[1]
Parallax (π)	5.0899±0.0792 mas[1]
Distance	641 ± 10 ly (196 ± 3 pc)
Orbit[4]
Period (P)	1895±132 d
Semi-major axis (a)	1.02±0.06–1.17±0.07 AU
Eccentricity (e)	0.59±0.22
Periastron epoch (T)	2453163±214 JD
Argument of periastron (ω) (secondary)	106±26°
Semi-amplitude (K1) (primary)	2.433±0.44 km/s
Details
ChaHα8 A
Mass	0.07–0.10[3] M☉
Temperature	2910–3024[3] K
Rotational velocity (v sin i)	15.5±2.6[3] km/s
Age	~3[3] Myr
ChaHα8 B
Mass	25±7–31±8[4] MJup
Other designations
2MASS J11074610-7740089, CHSM 10837, SBC9 3352, Cha Hα 8[2]
Database references
SIMBAD	data

It was found in 2007 to have a low-mass substellar companion in orbit around it via radial velocity observations.^[3] The companion has a mass of 25–31 Jupiter masses, and the pair orbit each other with a period of 5.2 years and an eccentricity of 0.59.^[4]