| Discovery | |
|---|---|
| Discovered by | Vogt et al. |
| Discovery site |  California, United States |
| Discovery date | June 24, 2005 |
| Detection method | Doppler spectroscopy |
| Orbital characteristics | |
| Apastron | 2.02 AU (302,000,000 km) |
| Periastron | 1.46 AU (218,000,000 km) |
| Semi-major axis | 1.740 ± 0.010 AU (260,300,000 ± 1,500,000 km) |
| Eccentricity | 0.159±0.006 |
| Orbital period (sidereal) | 921.538 ± 1.15 d (2.52303 ± 0.00315 a) |
| Average orbital speed | 20.7 |
| Inclination | 55.950±14.553 |
| Longitude of ascending node | 229.392±14.473 |
| Time of periastron | 2449565.615±18.01 |
| Argument of periastron | 15.445±6.87 |
| Semi-amplitude | 74.799±1.497 |
| Star | HD 128311 |
| Physical characteristics | |
| Mass | 3.789+0.924 −0.432 MJ |
HD 128311 c is an exoplanet located approximately 54 light-years away in the constellation of Boötes. This planet orbits in an eccentric orbit at 1.74 AU from its star (HD 128311). The planet has a minimum mass of 3.22 MJ, and astrometric observations in 2014 revealed its true mass to be 3.789 MJ.
References
- ^ McArthur, Barbara E.; et al. (2014). "Astrometry, Radial Velocity, and Photometry: The HD 128311 System Remixed with Data from HST, HET, and APT". The Astrophysical Journal. 795 (1): 41. Bibcode:2014ApJ...795...41M. doi:10.1088/0004-637X/795/1/41. S2CID 122980723.
- 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. S2CID 16509245.
External links
- "Notes for planet HD 128311 c". Extrasolar Planets Encyclopaedia. Retrieved 2008-08-18.
- "HD 128311". Exoplanets. Archived from the original on 2008-05-14. Retrieved 2008-08-18.
| HD 128311 System | |
|---|---|
| Stars | |
| Planets | |
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