WASP-58
WASP-58 is a binary star system comprising a G-type main-sequence star and a red dwarf about 955 light-years away. WASP-58 is slightly depleted in heavy elements, having 80% of the solar abundance of iron. WASP-58 is much older than the Sun at 12.80+0.20
−2.10 billion years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 18m 48.2531s |
| Declination | 45° 10′ 19.2592″ |
| Apparent magnitude (V) | 11.66 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G2V |
| Astrometry | |
| Radial velocity (Rv) | -28.708 km/s |
| Proper motion (μ) | RA: 32.579 mas/yr Dec.: 47.140 mas/yr |
| Parallax (π) | 3.4147 ± 0.0214 mas |
| Distance | 955 ± 6 ly (293 ± 2 pc) |
| Orbit | |
| Primary | WASP-58A |
| Companion | WASP-58B |
| Semi-major axis (a) | 1.281±0.002" (384±64 AU) |
| Details | |
| WASP-58A | |
| Mass | 0.940±0.100 M☉ |
| Radius | 1.17±0.13 R☉ |
| Surface gravity (log g) | 4.23±0.1 cgs |
| Temperature | 6039±55 K |
| Metallicity [Fe/H] | -0.09±0.04 dex |
| Rotation | 22.6+11.7 −6.1 d |
| Rotational velocity (v sin i) | 2.8±0.9 km/s |
| Age | 12.80+0.20 −2.10 Gyr |
| WASP-58B | |
| Temperature | 3396±53 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Lithium was detected in the stellar spectrum of WASP-58A, making the star anomalous for its advanced age.
A multiplicity survey in 2015 did detect a red dwarf stellar companion at a projected separation of 1.281±0.002″ to WASP-58A, and it was confirmed to be gravitationally bound in 2016.
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