HD 128311 b
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]
| Discovery | |
|---|---|
| Discovered by | Butler et al. |
| Discovery site |  California, United States |
| Discovery date | 2002 |
| Doppler Spectroscopy | |
| Orbital characteristics | |
| Apastron | 1.380 AU (206,400,000 km) |
| Periastron | 0.820 AU (122,700,000 km) |
| 1.100 ± 0.065 AU (164,600,000 ± 9,700,000 km) | |
| Eccentricity | 0.25 ± 0.10 |
| 458.6 ± 6.8 d 1.256 y | |
Average orbital speed | 26.2 |
| 2,450,211 ± 76 | |
| 111° ± 36° | |
| Semi-amplitude | 66.8 ± 8.7 |
| Star | HD 128311 |
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. CiteSeerX 10.1.1.7.6988. doi:10.1086/344570.
- Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems" (PDF). 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. Archived from the original on 2008-05-14. Retrieved 2008-08-18.
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