WASP-55

WASP-55 is a G-type main-sequence star about 954 light-years away in the constellation Virgo. The star is much younger than the Sun at approximately 1.1+0.8
−0.6 billion years.^[8] WASP-55 is similar to the Sun in concentration of heavy elements.^[10]

WASP-55

Observation data Epoch J2000      Equinox J2000
Constellation	Virgo[1]
Right ascension	13h 35m 01.9538s[2]
Declination	−17° 30′ 12.528″[2]
Apparent magnitude (V)	11.75[3]
Characteristics
Evolutionary stage	Main sequence[4]
Spectral type	G1[4]
Astrometry
Radial velocity (Rv)	−3.31±0.87[2] km/s
Proper motion (μ)	RA: +12.037 mas/yr[2] Dec.: −3.747 mas/yr[2]
Parallax (π)	3.4194±0.0204 mas[2]
Distance	954 ± 6 ly (292 ± 2 pc)
Details
Mass	1.16±0.03[5] M☉
Radius	1.11±0.01[5] R☉
Luminosity	1.48[6] L☉
Surface gravity (log g)	4.413±0.006[5] cgs
Temperature	6,070+51 −46[5] K
Metallicity [Fe/H]	0.09±0.05[5] dex
Rotational velocity (v sin i)	3.1±1.0[7] km/s
Age	1.1+0.8 −0.6[8] Gyr
Other designations
EPIC 212300977, TOI-774, TIC 294301883, WASP-55, TYC 6125-113-1, 2MASS J13350194-1730124[9]
Database references
SIMBAD	data
Exoplanet Archive	data

A multiplicity survey in 2016 found one candidate stellar companion to WASP-55 at a projected separation of 4.435″±0.018″.^[11] Follow-up observations in 2017 were unable to confirm if the suspected companion red dwarf star, with a temperature of 3,340±90 K, is gravitationally bound to WASP-55 or not.^[12] It was confirmed in 2019 using Gaia DR2 data.^[13]

Planetary system

In 2012 a transiting hot Jupiter planet, WASP-55b, was detected on a tight, circular orbit.^[14] Its equilibrium temperature is 1,305 K.^[5]

The WASP-55 planetary system^[5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.62±0.04 MJ	0.0558±0.0006	4.4656291(11)[8]	<0.056[7]	89.0±0.2°	1.34±0.01 RJ