WASP-56

WASP-56 is a sun-like star of spectral type G6 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 arc seconds away, however it is not known if this is an actual binary companion or an optical double.^[8]

WASP-56

Observation data Epoch J2000      Equinox J2000
Constellation	Coma Berenices[1]
Right ascension	12h 13m 27.8904s[2]
Declination	+23° 03′ 20.459″[2]
Apparent magnitude (V)	11.48[3]
Characteristics
Evolutionary stage	main sequence star
Spectral type	G6[4]
Astrometry
Radial velocity (Rv)	4.636 km/s
Proper motion (μ)	RA: −36.262±0.810[2] mas/yr Dec.: 0.871±0.590[2] mas/yr
Parallax (π)	3.0865±0.0511 mas[2]
Distance	1,060 ± 20 ly (324 ± 5 pc)
Details[5]
Mass	1.107±0.024[6] M☉
Radius	1.112+0.026 −0.022[6] R☉
Surface gravity (log g)	4.45 ± 0.1 cgs
Temperature	5600 ± 100 K
Metallicity [Fe/H]	0.12±0.06[6] dex
Rotational velocity (v sin i)	1.5 ± 0.9 km/s
Age	6.2+3.0 −2.1[6] Gyr
Other designations
Melotte 111 AV 561, Gaia DR2 4001613814138156416, TYC 1986-1561-1, 2MASS J12132790+2303205
Database references
SIMBAD	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.^[5] 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.^[5]

The WASP-56 planetary system^[6]

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