WASP-56

WASP-56 is a sun-like star of spectral type G6 about 1,070 light-years away in the constellation of Coma Berenices.^[7] It has an apparent magnitude of 11.48. Observations at the Calar Alto Observatory using the lucky imaging technique detected a candidate companion star located 3.4 arcseconds away, however it was not known if this is an actual binary companion or an optical double.^[8] It was confirmed in 2019 using Gaia DR2 data.^[9]

WASP-56

Observation data Epoch J2000      Equinox J2000
Constellation	Coma Berenices[1]
Right ascension	12h 13m 27.8908s[2]
Declination	+23° 03′ 20.428″[2]
Apparent magnitude (V)	11.48[3]
Characteristics
Evolutionary stage	main sequence[4]
Spectral type	G6V[4]
Astrometry
Radial velocity (Rv)	5.97±0.80[2] km/s
Proper motion (μ)	RA: −36.695 mas/yr[2] Dec.: 2.954 mas/yr[2]
Parallax (π)	3.0471±0.0162 mas[2]
Distance	1,070 ± 6 ly (328 ± 2 pc)
Details[4]
Mass	1.107±0.024[5] M☉
Radius	1.112+0.026 −0.022[5] R☉
Surface gravity (log g)	4.45 ± 0.1 cgs
Temperature	5600 ± 100 K
Metallicity [Fe/H]	0.12±0.06[5] dex
Rotational velocity (v sin i)	1.5 ± 0.9 km/s
Age	6.2+3.0 −2.1[5] Gyr
Other designations
Melotte 111 AV 561, TOI-1809, TIC 347329162, WASP-56, TYC 1986-1561-1, 2MASS J12132790+2303205[6]
Database references
SIMBAD	data
Exoplanet Archive	data

Planetary system

It has a planet that was discovered by transit photometry in 2011 by the SuperWASP program. Fourteen transits were observed over three watching seasons, each lasting 214 minutes and reducing the stars' brightness by 14 millimagnitudes.^[4] The planet has around 0.6 times the mass of Jupiter and an orbital period of 4.6 days. The planet possibly has a large core of heavy metals.^[4]

The WASP-56 planetary system^[5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.599+0.040 −0.039 MJ	0.05614+0.00040 −0.00041	4.6171010±0.000003	<0.082	88.5+0.1 −0.2°	1.092+0.035 −0.033 RJ