WASP-57

WASP-57 is a single G-type main-sequence star about 1,322 light-years away in the constellation Libra. WASP-57 is depleted in heavy elements, having 55% of the solar abundance of iron.^[4] WASP-57 is much younger than the Sun at 0.957±0.518 billion years.^[6]

WASP-57

Observation data Epoch J2000      Equinox J2000
Constellation	Libra[1]
Right ascension	14h 55m 16.82284s[2]
Declination	−02° 03′ 27.5996″[2]
Apparent magnitude (V)	13.04[3]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	G6V[3]
Astrometry
Radial velocity (Rv)	−23.90±1.73[2] km/s
Proper motion (μ)	RA: -27.009 mas/yr[2] Dec.: -4.655 mas/yr[2]
Parallax (π)	2.4676±0.0162 mas[2]
Distance	1,322 ± 9 ly (405 ± 3 pc)
Details[4]
Mass	0.886±0.061 M☉
Radius	0.927±0.031 R☉
Surface gravity (log g)	4.452±0.024[5] cgs
Temperature	5600±100 K
Metallicity [Fe/H]	-0.25±0.1 dex
Rotation	12.7±4.5[6] days
Rotational velocity (v sin i)	3.7±1.3 km/s
Age	0.957±0.518[6] Gyr
Other designations
TOI-5673, TIC 175772482, WASP-57, GSC 04991-00565, 2MASS J14551682-0203275[7]
Database references
SIMBAD	data
Exoplanet Archive	data

A multiplicity survey in 2015 did not detect any stellar companions to WASP-57.^[8]

Planetary system

In 2012 a transiting hot Jupiter planet, WASP-57b, was detected on a tight, circular orbit around WASP-57.^[3] The planetary equilibrium temperature is 1338±29 K.^[5]

The WASP-57 planetary system^[4]

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