WASP-90

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.

WASP-90

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.

The WASP-90 planetary system^[4]

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