WASP-90
Star in the constellation Equuleus
From Wikipedia, the free encyclopedia
WASP-90 is a faint 11th magnitude star located in the northern constellation Equuleus. With an apparent magnitude of 11.63, it is too faint to be detected with the naked eye, but can be seen with a telescope, and is located 1,560 ly (480 pc) from the Solar System.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Equuleus[1] |
| Right ascension | 21h 02m 07.6772s[2] |
| Declination | +07° 03′ 22.518″[2] |
| Apparent magnitude (V) | 11.63[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4][2] |
| Spectral type | F6[4] |
| Astrometry | |
| Proper motion (μ) | RA: −9.080(31) mas/yr[2] Dec.: 5.645(23) mas/yr[2] |
| Parallax (π) | 2.0870±0.0334 mas[2] |
| Distance | 1,560 ± 30 ly (479 ± 8 pc) |
| Details[4] | |
| Mass | 1.55±0.10 M☉ |
| Radius | 1.98±0.09 R☉ |
| Luminosity | 4.3±0.2[5] L☉ |
| Surface gravity (log g) | 4.03±0.03 cgs |
| Temperature | 6228+125 −133[6] K |
| Metallicity [Fe/H] | 0.11±0.14 dex |
| Rotational velocity (v sin i) | 6.0±0.5 km/s |
| Age | 4.40+8.40 −2.40 Gyr |
| Other designations | |
| Gaia DR2 1737061349198867456 | |
| Database references | |
| SIMBAD | data |
Properties
WASP-90 has a classification of F6. The exoplanet discovery paper describes it as having expanded to a "post-MS" radius, about twice that of the Sun. WASP-90 is 55% more massive than the Sun, and radiates at 4.3 times the Sun's luminosity from its photosphere at an effective temperature of 6,430 K. Despite it being a similar age to the Sun, the star has a high metallicity that is 28% greater than that of the Sun.[4]
Planetary system
In 2016, a bloated "hot Jupiter" was discovered orbiting the star. Due to the host's state, the planet is extremely irradiated.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.63±0.07 MJ | 0.06±0.00 | 3.92±0.00 | 0.00 | 82.1±0.4° | 1.63±0.09 RJ |