WASP-57

WASP-57 is a single G-type main-sequence star about 1310 light-years away. WASP-57 is depleted in heavy elements, having 55% of the solar abundance of iron.^[3] WASP-57 is much younger than the Sun at 0.957±0.518 billion years.^[5]

WASP-57

Observation data Epoch J2000      Equinox J2000
Constellation	Libra
Right ascension	14h 55m 16.8229s[1]
Declination	−02° 03′ 27.5991″[1]
Apparent magnitude (V)	13.04
Characteristics
Evolutionary stage	Main sequence
Spectral type	G6[2]
Astrometry
Radial velocity (Rv)	-23.290[1] km/s
Proper motion (μ)	RA: -27.064[1] mas/yr Dec.: -4.687[1] mas/yr
Parallax (π)	2.4826±0.0359 mas[1]
Distance	1,310 ± 20 ly (403 ± 6 pc)
Details[3]
Mass	0.886±0.061 M☉
Radius	0.927±0.031 R☉
Surface gravity (log g)	4.452±0.024[4] cgs
Temperature	5600±100 K
Metallicity [Fe/H]	-0.25±0.1 dex
Rotation	12.7±4.5[5]
Rotational velocity (v sin i)	3.7±1.3 km/s
Age	0.957±0.518[5] Gyr
Other designations
Gaia DR2 6340377202215639936, GSC 04991-00565, 2MASS J14551682-0203275[2]
Database references
SIMBAD	data

A multiplicity survey in 2015 did not detect any stellar companions to WASP-57.^[6]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit around WASP-57.^[7]

Planetary equilibrium temperature is 1338±29 K.^[4]

The WASP-57 planetary system^[3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.643+0.056 −0.054 MJ	0.03772+0.00083 −0.00089	2.83891856±0.00000081	<0.059	86.05±0.20°	1.050±0.052 RJ