WASP-59
Star in the constellation Pegasus
From Wikipedia, the free encyclopedia
WASP-59 is a K-type main-sequence star about 379 light-years away in the constellation Pegasus. The star's age is essentially unconstrained by observations. WASP-59 is slightly depleted in heavy elements, having 70% of the solar abundance of iron.[5] The star produces extremely low levels of ultraviolet light, indicating an absence of flare activity.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 23h 18m 29.54747s[2] |
| Declination | +24° 53′ 21.4386″[2] |
| Apparent magnitude (V) | 12.78[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | K5V[4] |
| Astrometry | |
| Radial velocity (Rv) | −57.07±0.44[2] km/s |
| Proper motion (μ) | RA: −33.675 mas/yr[2] Dec.: −2.675 mas/yr[2] |
| Parallax (π) | 8.6178±0.0140 mas[2] |
| Distance | 378.5 ± 0.6 ly (116.0 ± 0.2 pc) |
| Details[5] | |
| Mass | 0.719±0.035 M☉ |
| Radius | 0.613±0.044 R☉ |
| Surface gravity (log g) | 4.72±0.06[4] cgs |
| Temperature | 4650±150 K |
| Metallicity [Fe/H] | -0.15±0.11 dex |
| Rotational velocity (v sin i) | 2.3±1.5 km/s |
| Age | 7±7 Gyr |
| Other designations | |
| TOI-5969, TIC 91051152, WASP-59, 2MASS J23182955+2453214[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
A multiplicity survey in 2015 did not detect any stellar companions to WASP-59.[7]
Planetary system
In 2012 a transiting hot Jupiter planet, WASP-59b, was detected on a tight, mildly eccentric orbit.[4]
Its equilibrium temperature is 670±35 K.[4] The planet is unusually dense for a gas giant, representing an outlier on the mass-radius diagram.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.857+0.046 −0.047 MJ |
0.0697±0.0011 | 7.919585±0.000010 | 0.101+0.046 −0.048 |
89.27±0.52° | 0.775±0.068 RJ |
