HD 128311 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 128311 | |
| Constellation | Boötes | |
| Right ascension | (α) | 14h 36m 00.5607s |
| Declination | (δ) | +09° 44′ 47.466″ |
| Distance | 54.14 ly (18.04 pc) | |
| Spectral type | K0V | |
| Mass | (m) | 0.8 M☉ |
| Radius | (r) | 0.73 R☉ |
| Temperature | (T) | 4965 K |
| Metallicity | [Fe/H] | 0.03 |
| Age | 0.39 Gyr | |
| Orbital elements | ||
| Semi-major axis | (a) | 1.100 ± 0.065 AU |
| Periastron | (q) | 0.820 AU |
| Apastron | (Q) | 1.380 AU |
| Eccentricity | (e) | 0.25 ± 0.10 |
| Orbital period | (P) | 458.6 ± 6.8 d (1.256 y) |
| Orbital speed | (υ) | 26.2 km/s |
| Argument of periastron |
(ω) | 111° ± 36°° |
| Time of periastron | (T0) | 2,450,211 ± 76 JD |
| Semi-amplitude | (K) | 66.8 ± 8.7 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 2.19 ± 0.20 MJ (696 ± 64 M⊕) |
| Discovery information | ||
| Discovery date | 2002 | |
| Discoverer(s) | Butler et al. | |
| Discovery method | Doppler Spectroscopy | |
| Discovery site |  California, United States | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 128311 b is an exoplanet[1] located approximately 54 light-years away in the constellation of Boötes. This planet orbits in an eccentric orbit about 1.1 AU from its star (HD 128311). The planet has minimum mass 2.19 Jupiter masses.[2]
References
- ↑ Butler, R. Paul; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal. 582 (1): 455–466. Bibcode:2003ApJ...582..455B. doi:10.1086/344570.
- ↑ Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901.
External links
- "Notes for planet HD 128311 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-18.
- "HD 128311". Exoplanets. Retrieved 2008-08-18.
Coordinates: 
14h 36m 00.5607s, +09° 44′ 47.466″
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