HD 68988
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Ursa Major |
| Right ascension | 08h 18m 22.2s |
| Declination | +61° 27′ 38.6″ |
| Apparent magnitude (V) | +8.21 |
| Distance | 192 ly (58.8 pc) |
| Spectral type | G0 |
| Other designations | |
HD 68988 is a star in Ursa Major constellation. It is an eighth magnitude yellow dwarf.
Contents |
[edit] Planets
There is one confirmed and one unconfirmed planet discovered in 2001 and 2006 respectively.
[edit] HD 68988 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.0704 AU | |
| Eccentricity e: | 0.1497 ± 0.0079 | |
| Orbital period P: | 6.27670 ± 0.000053 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 1.20 mas | |
| Longitude of periastron ω: |
40 ± 170° | |
| Time of periastron τ: | 2451549.062 ± 0.040 JD | |
| Semi-amplitude K: | 191.6 ± 1.7 m/s | |
| Physical characteristics | ||
| Mass: | >1.92 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2001 | |
| Discovery site: | ||
| Detection method(s): | Radial velocity | |
| Discoverer(s): | Butler et al. | |
| Other catalogue | ||
HD 68988 b is a jovian planet. The planet is a hot jupiter that orbits in moderate eccentricity.
[edit] HD 68988 c
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 5.32 AU | |
| Eccentricity e: | 0.01 ± 0.27 | |
| Orbital period P: | 4100 ± 7300 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 103.448 mas | |
| Longitude of periastron ω: |
129° | |
| Time of periastron τ: | 2452730 ± 510 JD | |
| Semi-amplitude K: | 60 ± 11 m/s | |
| Physical characteristics | ||
| Mass: | >5.29 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2006 (TBC) | |
| Discovery site: | California, US | |
| Detection method(s): | Radial velocity | |
| Discoverer(s): | Wright et al. | |
| Other catalogue | ||
HD 68988 c is an unconfirmed planetary companion. The parameters including period and eccentricity are highly uncertain. The semimajor axis would be 5.32 AU with an orbital period of 4100 ± 7300 days (11 years).
[edit] References
- Vogt et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal 568 (1): 352 – 362. doi:.
- Butler et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505 – 522. doi:. (web Preprint)
- Wright, J. T.; Marcy, G. W.; Fischer, D. A.; Butler, R. P.; Vogt, S. S.; Tinney, C. G.; Jones, H. R. A.; Carter, B. D.; Johnson, J. A.; McCarthy, C.; Apps, K. (2006). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars".
[edit] External links
 |
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. |
