WASP-28

WASP-28 is a F8V-type main sequence star located 1116 light-years from Earth in the constellation of Pisces. It has a mass of 0.9 solar masses and a radius of 1.08 solar radii.^[6] It is an aged and cool star being around 5 billion years old and having a temperature at around 6100 Kelvin.^[3]

WASP-28

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Pisces[1]
Right ascension	23h 34m 27.88149s[2]
Declination	−01° 34′ 48.1101″[2]
Apparent magnitude (V)	12.03[3]
Characteristics
Evolutionary stage	main sequence[2]
Spectral type	F8[3]
Astrometry
Radial velocity (Rv)	+25.20±1.08[2] km/s
Proper motion (μ)	RA: +22.422 mas/yr[2] Dec.: +10.591 mas/yr[2]
Parallax (π)	2.9215±0.0151 mas[2]
Distance	1,116 ± 6 ly (342 ± 2 pc)
Details[3]
Mass	0.993±0.067[4] M☉
Radius	1.083±0.025[4] R☉
Surface gravity (log g)	4.370±0.018 cgs
Temperature	6150±140 K
Metallicity [Fe/H]	−0.29±0.10 dex
Rotational velocity (v sin i)	3.25±0.34 km/s
Age	5.5±2.6[4] Gyr
Other designations
K2-1, EPIC 246375295, TOI-4518, TIC 398572544, WASP-28, 2MASS J23342787-0134482[5]
Database references
SIMBAD	data
Exoplanet Archive	data

Planetary system

The only known exoplanet orbiting around this star is WASP-28b, a highly irradiated and inflated hot Jupiter. It has a mass of 0.9 Jupiters and a radius of 1.3 Jupiters. It orbits at a distance of 0.044 AU taking about 3.4 days to complete an orbit around its star. The orbit has an eccentricity of 0.975 and an inclination of 88.61°.^[3]

The WASP-28 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.889±0.058 MJ	0.0442±0.0010	3.40883495(15)	<0.075	88.514±0.090°	1.219±0.028 RJ