| Discovery | |
|---|---|
| Discovered by | Harakawa et al. |
| Discovery site | Subaru Telescope and Keck Observatory |
| Discovery date | 2010 |
| Detection method | Doppler spectroscopy |
| Orbital characteristics | |
| Semi-major axis | 1.66±0.11 AU |
| Eccentricity | 0.059±0.026 |
| Orbital period (sidereal) | 686.8±1.4 d |
| Time of perihelion | 2453849±27 JD |
| Argument of perihelion | 296±14 º |
| Semi-amplitude | 196.3±3.8 m/s |
| Star | HD 38801 |
| Physical characteristics | |
| Mass | ≥10.13±23 MJ |
HD 38801 b is an extrasolar gas giant planet located in the constellation of Orion whose discovery was announced in 2009 and was made using the radial velocity method. The object, with a mass roughly 12 times that of Jupiter, is located 324 light years (99.4 parsecs) from Earth orbiting 1.65 astronomical units from its G-type star, HD 38801. HD 38801 b, besides being the only planet in its system also lies within the inner habitable zone and takes around 1.9 years, or 693.5 days to complete a full orbit.
HD 38801 b is characterized by its uniquely low eccentricity values, or having a near circular orbit. As a super massive planet with an orbital period of hundreds of days, this occurrence is quite uncommon.
References
- ^ Harakawa, Hiroki; et al. (2010). "Detection of a Low-eccentricity and Super-massive Planet to the Subgiant HD 38801". The Astrophysical Journal. 715 (1): 550–553. arXiv:1004.1779. Bibcode:2010ApJ...715..550H. doi:10.1088/0004-637X/715/1/550.
- ^ Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0.
- "Exoplorer: Hd-38801-b".
- ^ "HD 38801 b – New World Atlas – Exoplanet Exploration: Planets Beyond our Solar System". Exoplanet Exploration: Planets Beyond our Solar System. Archived from the original on 2018-10-11.
- ^ "Open Exoplanet Catalogue - HD 38801 B".
- ^ "HD 38801". exoplanetkyoto.org.
- "HD 38801 b". exoplanetarchive.ipac.caltech.edu.