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 | |
Database references | |
SIMBAD | data |
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]
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]