WASP-18
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Phoenix[1] |
| Right ascension | 01h 37m 25.034s[2] |
| Declination | –45° 40′ 40.39″[2] |
| Apparent magnitude (V) | 9.3[3] |
| Characteristics | |
| Spectral type | F6[3] |
| Astrometry | |
| Proper motion (μ) | RA: 26.52 ± 0.95[2] mas/yr Dec.: 18.79 ± 1.06[2] mas/yr |
| Parallax (π) | 10.06±1.07 mas[2] |
| Distance | approx. 320 ly (approx. 100 pc) |
| Details | |
| Mass | 1.256 ± 0.13[3] M☉ |
| Radius | 1.216 +0.067 −0.054[3] R☉ |
| Surface gravity (log g) | 4.37 ± 0.03[4] cgs |
| Temperature | 6368 ± 66[4] K |
| Metallicity [Fe/H] | 0.11 ± 0.08[4] dex |
| Rotational velocity (v sin i) | 11.9 ± 1.2[4] km/s |
| Age | 0.5–1.5[3] Gyr |
| Other designations | |
| HD 10069, HIP 7562, PPM 306061, SAO 215585 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-18 is a magnitude 9 star located in the Phoenix constellation of the southern hemisphere.[1] It has a mass of 1.25 solar masses.[5]
Planetary system
In 2009 SuperWASP project announced that a large hot Jupiter type extrasolar planet, WASP-18b, was orbiting very close to this star.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ~10[3] MJ | 0.020206 | 0.94145299[1] | 0.0092 | — | — |
References
- ^ a b c "WASP-18b". Exoplanet Transit Database. Retrieved 2009-08-29.
- ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
- ^ a b c d e f g Hellier, Coel; et al. (2009). "An orbital period of 0.94days for the hot-Jupiter planet WASP-18b" (PDF). Nature. 460 (7259): 1098–1100. Bibcode:2009Natur.460.1098H. doi:10.1038/nature08245.
- ^ a b c d 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.
- ^ PlanetQuest: WASP-18 b
See also
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