WASP-17
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 15h 59m 51s |
| Declination | –28° 03′ 42″ |
| Apparent magnitude (V) | 11.500[1] |
| Characteristics | |
| Spectral type | F6V |
| Astrometry | |
| Distance | ~1,000 ly (~300 pc) |
| Details | |
| Mass | 1.2 M☉ |
| Radius | 1.38 R☉ |
| Surface gravity (log g) | 4.14 ± 0.03[2] cgs |
| Temperature | 6509 ± 86[2] K |
| Metallicity [Fe/H] | –0.02 ± 0.09[2] dex |
| Rotational velocity (v sin i) | 10.6 ± 1.3[2] km/s |
| Age | 3 Gyr |
| Other designations | |
1SWASP J155950.94−280342.3, USNO-B1.0 0619-0419495, 2MASS 15595095−2803422 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
WASP-17 is an F-type main sequence star approximately 1,000 light-years away in the constellation Scorpius.[3][4] As of 2009, an extrasolar planet has been confirmed to orbit the star. The planet is thought to orbit in a retrograde orbit (in the opposite direction to the star's rotation).
Planetary system
Main article: WASP-17b
The star is unusual in that it has an orbiting exoplanet, WASP-17b,[5][6] which is believed to orbit in the opposite direction to the star's spin and is said to be twice the size of Jupiter, but half its mass.
The planet was discovered by the SuperWASP project, hence the name.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.486 (± 0.032) MJ | 0.0515 (± 0.00034) | 3.735438 (± 6.8e-06) | 0.028 +0.018 −0.015 |
— | — |
References
- ↑ Maxted, P. F. L.; et al. (2011). "UBV(RI)C photometry of transiting planet hosting stars". Monthly Notices of the Royal Astronomical Society. 418 (2): 1039–1042. arXiv:1108.0349
. Bibcode:2011MNRAS.418.1039M. doi:10.1111/j.1365-2966.2011.19554.x. - 1 2 3 4 Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161.
- ↑ Anderson, D. R.; et al. (2010). "WASP-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit". The Astrophysical Journal. 709 (1): 159–167. arXiv:0908.1553. Bibcode:2010ApJ...709..159A. doi:10.1088/0004-637X/709/1/159.
- ↑ http://www.space.com/scienceastronomy/090812-backward-planet.html
- ↑ BBC NEWS | Science & Environment |
- ↑ New-found Planet Orbits Backward
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