ChaHα8
Binary brown dwarf in the constellation Chamaleon From Wikipedia, the free encyclopedia
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]
| 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]
References
External links
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