WASP-18
WASP-18 is a magnitude 9 star located 400 light-years (120 parsecs) away in the Phoenix constellation of the southern hemisphere. It has a mass of 1.29 solar masses.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 01h 37m 25.03328s |
| Declination | −45° 40′ 40.3747″ |
| Apparent magnitude (V) | 9.273 |
| Characteristics | |
| Spectral type | F6IV/V + M6.5V |
| Astrometry | |
| Radial velocity (Rv) | 3.47±0.34 km/s |
| Proper motion (μ) | RA: 25.404(10) mas/yr Dec.: 20.479(11) mas/yr |
| Parallax (π) | 8.1443 ± 0.0116 mas |
| Distance | 400.5 ± 0.6 ly (122.8 ± 0.2 pc) |
| Details | |
| Mass | 1.294+0.063 −0.061 M☉ |
| Radius | 1.319+0.061 −0.062 R☉ |
| Luminosity | 2.68+0.28 −0.26 L☉ |
| Surface gravity (log g) | 4.310+0.036 −0.033 cgs |
| Temperature | 6432±48 K |
| Metallicity [Fe/H] | 0.107±0.080 dex |
| Rotational velocity (v sin i) | 11.9±1.2 km/s |
| Age | 1.57+1.4 −0.94 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
The star, although similar to the Sun in terms of overall contents of heavy elements, is depleted in carbon. The carbon to oxygen molar ratio of 0.23±0.05 for WASP-18 is well below the solar ratio of 0.55.
There is a red dwarf companion star at a separation of 3,519 AU.
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