HD 178911
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Lyra |
| Right ascension | 19h 09m 04.3838s |
| Declination | +34º 36' 01.6250″ |
| Apparent magnitude (V) | 6.74 |
| Absolute magnitude (V) | 3.29 |
| Distance | 160 ly (49.0 pc) |
| Spectral type | G1V |
| Other designations | |
HD 178911 is a binary star system in the constellation Lyra. The secondary star (designated as HD 178911 B) has an apparent magnitude of 6.74 and a spectral type of G1V, which is very similar to our Sun at a distance of 160 light years. The age of the star is slightly older and have significantly higher metallicity than our Sun.
As it is typical for few metal-rich Sun-like stars, it has at least one planet in orbit around this secondary star.
[edit] HD 178911 Bb
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.345 AU |
| Eccentricity | (e) | 0.139±0.14 |
| Orbital period | (P) | 71.511±0.011 d |
| Angular distance | (θ) | 7.04 mas |
| Longitude of periastron |
(ω) | 172.3±5° |
| Time of periastron | (T0) | 2,451,378.23±83 JD |
| Semi-amplitude | (K) | 346.9±4.2 m/s |
| Physical characteristics | ||
| Mass | (m) | >7.35 MJ |
| Discovery information | ||
| Discovery date | April 4, 2001 | |
| Discoverer(s) | Zucker et al. | |
| Detection method | Radial velocity | |
| Discovery status | Published | |
HD 178911 Bb is a planet discovered in 2001 by Zucker who used radial velocity method. The minimum mass of this giant planet is 7.35 times that of Jupiter that orbits close to the star. The period of the planet is 71.5 days and the semi-amplitude is 346.9 m/s.
[edit] References
- Zucker et al. (2002). "A Planet Candidate in the Stellar Triple System HD 178911". ApJ 568: 363–368. doi:.
[edit] External links
- NLTT 47473 -- High proper-motion Star. SIMBAD Astronomical Database. Retrieved on December 12, 2007.
- HD 178911b -- Extra-solar Planet Candidate. SIMBAD Astronomical Database. Retrieved on December 12, 2007.
- Notes for star HD 178911 B. The Extrasolar Planets Encyclopaedia. Retrieved on December 12, 2007.
- Notes for planet HD 178911 Bb. The Extrasolar Planets Encyclopaedia. Retrieved on December 12, 2007.
- HD 178911 B -- Yellow Main Sequence Star. Extrasolar Visions. Retrieved on December 12, 2007.
- HD 178911 B B -- Clarified Jovian. Extrasolar Visions. Retrieved on December 12, 2007.
- Star Table. Catalog of Nearby Exoplanets. Retrieved on December 12, 2007.
- Planet Table. Catalog of Nearby Exoplanet. Retrieved on December 12, 2007.
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