HD 128311
From Wikipedia, the free encyclopedia
| Observation data Equinox 2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 36m 00.5607s |
| Declination | +09° 44' 47.466" |
| Apparent magnitude (V) | 7.48 |
| Distance | 54.14 ly (18.04 pc) |
| Spectral type | K0V |
HD 128311 is an orange main sequence star in the constellation Boötes. It is about 54 light years from the Sun. Two extrasolar planet candidates have been detected in orbit around this star.
[edit] HD 128311 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 1.099 AU | |
| Eccentricity e: | 0.25 ± 0.1 | |
| Orbital period P: | 448.6 ± 6.8 d | |
| Inclination i: | ?° | |
| Longitude of periastron ω: |
110.9 ± 36° | |
| Time of periastron τ: | 2450210.9 ± 76 JD | |
| Physical characteristics | ||
| Mass: | 2.18 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | June 13, 2002 | |
| Detection method(s): | Radial velocity | |
| Discoverer(s): | Butler et al. | |
HD 128311 b is an exoplanet orbiting in an eccentric orbit about 1 AU from its star.
[edit] HD 128311 c
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 1.76 AU | |
| Eccentricity e: | 0.17 ± 0.09 | |
| Orbital period P: | 919 d | |
| Inclination i: | ?° | |
| Longitude of periastron ω: |
195.5 ± 150° | |
| Time of periastron τ: | 2450012.2 ± 401 JD | |
| Physical characteristics | ||
| Mass: | 3.21 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2005 | |
| Detection method(s): | Radial velocity | |
| Discoverer(s): | Marcy et al. | |
HD 128311 c is an exoplanet orbiting in an eccentric orbit at 1.76 AU from its star.
[edit] References
- Vogt, S., Butler, R., Marcy, G., Fischer, D., Henry, G., Laughlin, G., Wright, J., Johnson, J. (2005). "Five New Multicomponent Planetary Systems". Astrophysical Journal 632: 638 – 658.
- Butler et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal 582: 455-466.
 |
This main sequence star-related article is a stub. You can help Wikipedia by expanding it. |
 |
This extrasolar planet related article is a stub. You can help Wikipedia by expanding it. |
