WASP-17

WASP-17
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 15h 59m 50.9473s[1]
Declination −28° 03′ 42.327″[1]
Apparent magnitude (V) 11.500[2]
Characteristics
Spectral type F6V
Astrometry
Proper motion (μ) RA: −6.600±1.557[1] mas/yr
Dec.: −8.485±0.774[1] mas/yr
Parallax (π)2.57 ± 0.31[1] mas
Distanceapprox. 1,300 ly
(approx. 390 pc)
Details
Mass1.2 M☉
Radius1.38 R☉
Surface gravity (log g)4.14 ± 0.03[3] cgs
Temperature6509 ± 86[3] K
Metallicity [Fe/H]–0.02 ± 0.09[3] dex
Rotational velocity (v sin i)10.6 ± 1.3[3] km/s
Age3 Gyr
Other designations
1SWASP J155950.94−280342.3,
USNO-B1.0 0619-0419495,
2MASS 15595095−2803422
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

WASP-17 is an F-type main sequence star approximately 1,300 light-years away in the constellation Scorpius.[4][1][5] 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

The star is unusual in that it has an orbiting exoplanet, WASP-17b,[6][7] 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.

The WASP-17 planetary system
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

  1. 1 2 3 4 5 6 Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. Gaia Data Release 1 catalog entry
  2. ↑ 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.
  3. 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.
  4. ↑ 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.
  5. ↑ http://www.space.com/scienceastronomy/090812-backward-planet.html
  6. ↑ BBC NEWS | Science & Environment |
  7. ↑ New-found Planet Orbits Backward


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.