WASP-54

WASP-54, also known as BD+00 3088, is a binary star system about 818 light-years away in the constellation Virgo. The primary, WASP-54A, is an F-type subgiant, accompanied by the red dwarf WASP-54B on a wide orbit. WASP-54 is depleted in heavy elements, having 55% of the solar abundance of iron.^[8] WASP-54 is slightly older than the Sun at 6.9^+1.0
_−1.9 billion years.^[8]

WASP-54

Observation data Epoch J2000      Equinox J2000
Constellation	Virgo[1]
Right ascension	13h 41m 49.0301s[2]
Declination	−00° 07′ 41.033″[2]
Apparent magnitude (V)	10.41[3]
Characteristics
Evolutionary stage	subgiant[4][5]
Spectral type	F8V[6]
Astrometry
Radial velocity (Rv)	−2.71±0.22[2] km/s
Proper motion (μ)	RA: −10.810 mas/yr[2] Dec.: −24.744 mas/yr[2]
Parallax (π)	3.9859±0.0200 mas[2]
Distance	818 ± 4 ly (251 ± 1 pc)
Orbit[7]
Primary	WASP-54A
Companion	WASP-54B
Semi-major axis (a)	5.728±0.006" (1450 AU)
Details[8]
WASP-54A
Mass	1.213±0.032 M☉
Radius	1.828+0.091 −0.081 R☉
Surface gravity (log g)	4.00±0.02[9] cgs
Temperature	6,100±100 K
Metallicity [Fe/H]	−0.27±0.08 dex
Rotational velocity (v sin i)	4.0±0.8 km/s
Age	6.9+1.0 −1.9 Gyr
WASP-54B
Mass	0.19±0.01[7] M☉
Temperature	3,216+26 −25[7] K
Other designations
BD+00 3088, TOI-1833, TIC 61098812, WASP-54, TYC 4967-678-1, GSC 04967-00678, 2MASS J13414903-0007410[10]
Database references
SIMBAD	A
	B
Exoplanet Archive	data

Star system

A multiplicity survey in 2017 detected a red dwarf stellar companion WASP-54B 5.7″ away from WASP-54A.^[11] The companion was proven to be co-moving in 2020.^[7]

Planetary system

In 2012 a transiting hot Jupiter planet, WASP-54b, was detected on a tight orbit around WASP-54A.^[12] The planetary equilibrium temperature is 1742+49
−69 K.^[12]

The WASP-54 planetary system^[8]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.606±0.018 MJ	0.04988+0.00043 −0.00045	3.6936411(59)	<0.06	84.97±0.61°	1.653+0.090 −0.083 RJ