HD 164427
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 18h 04m 42.5963s |
| Declination | −59° 12' 34.4690″ |
| Apparent magnitude (V) | 6.89 |
| Absolute magnitude (V) | 3.93 |
| Distance | 127.6 ly (39.12 pc) |
| Spectral type | G0+V |
| Other designations | |
164427 is a star in Pavo with a brown dwarf companion discovered in 2001 taking place in Australia.
HD 164427 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.46 AU |
| Eccentricity | (e) | 0.55 |
| Orbital period | (P) | 108.55 d |
| Argument of periastron |
(ω) | 55.2° |
| Time of periastron | (T0) | 2,451,189.3 JD |
| Semi-amplitude | (K) | 1398.5 m/s |
| Physical characteristics | ||
| Mass | (m) | >46 MJ |
| Radius | (r) | >1.4 RJ |
| Discovery information | ||
| Discovery date | 2001 | |
| Discoverer(s) | Tinney et al. | |
| Discovery method | Doppler Spectroscopy | |
| Discovery site | Australia | |
| Discovery status | Published | |
HD 164427 b is a brown dwarf with a minimum mass of 46 times that of Jupiter. It orbits at nearly half an astronomical unit or Earth-to-Sun distance away from its star (HD 164427). The angular separation between a brown dwarf and a yellow dwarf as viewed from Earth is 11.76 Milliarcseconds. It takes 108.55 Earth days to orbit eccentrically around HD 164427. It has a very high semi-amplitude of almost 1400 m/s, because this is a very massive object which exerts strong gravitational pull on its tugging star.[1]
References
- ↑ Tinney, C. G. et al. (2001). "First Results from the Anglo-Australian Planet Search: A Brown Dwarf Candidate and a 51 Peglike Planet". The Astrophysical Journal 551 (1): 507–511. arXiv:astro-ph/0012204. Bibcode:2001ApJ...551..507T. doi:10.1086/320097.
External links
- "HD 164427 -- Yellow Subgiant". Extrasolar Visions. Retrieved December 21, 2007.
- "HD 164427 B – Brown dwarf". Extrasolar Visions. Retrieved December 21, 2007.
- "NLTT 45831 -- High proper-motion Star". SIMBAD. Retrieved December 21, 2007.
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