WASP-4
WASP-4 is a G-type main-sequence star approximately 891 light-years away in the constellation of Phoenix. Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit.
Artistic rendering of WASP-4 b | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 23h 34m 15.0857s |
| Declination | −42° 03′ 41.048″ |
| Apparent magnitude (V) | 12.468±0.025 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G7V |
| Apparent magnitude (V) | 12.468±0.025 |
| Apparent magnitude (B) | 13.216±0.020 |
| Variable type | Planetary transit variable |
| Astrometry | |
| Radial velocity (Rv) | 57.61±0.76 km/s |
| Proper motion (μ) | RA: 9.950(12) mas/yr Dec.: −87.620(10) mas/yr |
| Parallax (π) | 3.6623 ± 0.0147 mas |
| Distance | 891 ± 4 ly (273 ± 1 pc) |
| Details | |
| Mass | 0.89±0.01 M☉ |
| Radius | 0.920±0.060 R☉ |
| Surface gravity (log g) | 4.484+0.037 −0.047 cgs |
| Temperature | 5436±34 K |
| Metallicity [Fe/H] | −0.050±0.040 dex |
| Rotation | 22.2±3.3 d |
| Rotational velocity (v sin i) | 2.2+0.6 −1.0 km/s |
| Age | 7.0±2.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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