WASP-55

WASP-55 is a G-type main-sequence star about 980 light-years away. The star is much younger than the Sun at approximately 1.1+0.8
−0.6 billion years.^[6] WASP-55 is similar to the Sun in concentration of heavy elements.^[5]

WASP-55

Observation data Epoch J2000      Equinox J2000
Constellation	Virgo[1]
Right ascension	13h 35m 01.9538s[2]
Declination	−17° 30′ 12.526″[2]
Apparent magnitude (V)	11.75[3]
Characteristics
Evolutionary stage	Main sequence[4]
Spectral type	G1[4]
Astrometry
Radial velocity (Rv)	−4.09[2] km/s
Proper motion (μ)	RA: +12.072[2] mas/yr Dec.: −3.837[2] mas/yr
Parallax (π)	3.3337±0.0438 mas[2]
Distance	980 ± 10 ly (300 ± 4 pc)
Details[5]
Mass	1.04±0.05 M☉
Radius	1.11+0.13 −0.09 R☉
Surface gravity (log g)	4.34 cgs
Temperature	5,965 K
Metallicity [Fe/H]	0.00 dex
Rotational velocity (v sin i)	2.7 km/s
Age	1.1+0.8 −0.6[6] Gyr
Other designations
Gaia DR2 3603529272750802560, EPIC 212300977, TYC 6125-113-1, 2MASS J13350194-1730124[7]
Database references
SIMBAD	data

A multiplicity survey in 2016 found one candidate stellar companion to WASP-55 at a projected separation of 4.435″±0.018″.^[8] 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.^[9]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit.^[10] Its equilibrium temperature is 1,305 K.^[11]

The WASP-55 planetary system^[12]

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[11]	4.4656291	<0.1	89.0±0.2[11]°	1.34±0.01[11] RJ