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From Wikipedia, the free encyclopedia
HD 81040 b is a massive gas giant exoplanet that orbits the star HD 81040, discovered in 2005 by radial velocity.[2] Its orbital period is just over 1000 days. It has a semimajor axis of about 1.95 AU, and its orbit is quite eccentric, at a little over 0.5.[3][4]
Radial velocity curve of HD 81040 b[1] | |
| Discovery | |
|---|---|
| Discovered by | Sozzetti et al.[2] |
| Discovery site | Observatoire de Haute-Provence in France |
| Discovery date | November 24, 2005 |
| Doppler Spectroscopy | |
| Orbital characteristics | |
| 1.946 ± 0.014 AU (291,100,000 ± 2,100,000 km)[3] | |
| Eccentricity | 0.525+0.024 −0.026[3] |
| 1,004.7 ± 3.0 days (2.7507 ± 0.0082 years)[4] | |
| Inclination | 111.4°+4.4° −4.7°[4] |
| 19.2°+5.0° −4.8°[4] | |
| 245511.1+10 −8.7[3] | |
| 73.1°±4.3°[4] | |
| Semi-amplitude | 168 ± 9[2] |
| Star | HD 81040 |
| Physical characteristics | |
| Mass | 7.53±0.032 MJ[4] |
Astrometry of HD 81040 using Gaia, published in several papers, has determined an orbital inclination of about 111°. This, combined with the minimum mass, gives a true mass of 7.53 MJ.[3][1][5][6][4] Since the inclination is high, there is a small chance that the planet transits.[3]
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