Astronomy:ChaHα8
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Short description: Star in the constellation Chamaleon
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h 07m 46.102s[1] |
| Declination | −77° 40′ 08.94″[1] |
| Apparent magnitude (V) | 20.1[1] |
| Distance | 522 ly (160[2] pc) |
| Spectral type | M5.75–M6.5[2] |
| Other designations | |
| Database references | |
| SIMBAD | data |
ChaHα8 (also written ChaHa8 when Greek letters are unavailable) is a brown dwarf 522 light years from Earth discovered in 2000.[3]
Planetary/Brown dwarf system
It was found in 2007 to have a low-mass substellar companion in orbit around it.[2] The companion has a mass of 25–31 Jupiter masses and orbits with a period of 5.2 years and an eccentricity of 0.59.[4]
| Companion | Mass | Orbital period | Eccentricity |
| b | 25-31 MJ | 1899.3 days | 0.59 |
References
- ↑ 1.0 1.1 1.2 1.3 "CHSM 10837". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CHSM+10837.
- ↑ 2.0 2.1 2.2 Joergens, V.; A. Mueller (2007). "16–20 Jupiter mass RV companion orbiting the brown dwarf candidate ChaHa8". The Astrophysical Journal 666 (2). doi:10.1086/521825. Bibcode: 2007ApJ...666L.113J.
- ↑ Comerón, F.; Neuhäuser, R.; Kaas, A. A. (2000). "Probing the brown dwarf population of the Chamaeleon I star forming region". Astronomy and Astrophysics 359: 269–288. Bibcode: 2000A&A...359..269C.
- ↑ Joergens, V.; Müller, A.; Reffert, S. (2010). "Improved radial velocity orbit of the young binary brown dwarf candidate Cha Hα 8". Astronomy and Astrophysics 521 (A24): A24. doi:10.1051/0004-6361/201014853. Bibcode: 2010A&A...521A..24J.
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