WASP-56

WASP-56 is a sun-like star of spectral type G6 in the constellation of Coma Berenices.^[6] 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.^[7]

WASP-56

Observation data Epoch J2000      Equinox J2000
Constellation	Coma Berenices
Right ascension	12h 13m 27.8904s[1]
Declination	+23° 03′ 20.459″[1]
Apparent magnitude (V)	11.48[2]
Characteristics
Evolutionary stage	main sequence star
Spectral type	G6[3]
Astrometry
Radial velocity (Rv)	4.636 km/s
Proper motion (μ)	RA: −36.262±0.810[1] mas/yr Dec.: 0.871±0.590[1] mas/yr
Parallax (π)	3.0865 ± 0.0511 mas[1]
Distance	1,060 ± 20 ly (324 ± 5 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, 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.^[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

References

1. Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
3. "Cl* Melotte 111 AV 561". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 September 2013.
4. Faedi, F.; et al. (2013). "WASP-54b, WASP-56b, and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP". Astronomy & Astrophysics. 551: A73. arXiv:1210.2329. Bibcode:2013A&A...551A..73F. doi:10.1051/0004-6361/201220520. S2CID 14346225.
5. Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; et al. (2017). "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. A107: 602. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
6. "Coma Berenices, constellation boundary". The Constellations. International Astronomical Union. Retrieved 27 February 2014.
7. Wöllert, Maria; Brandner, Wolfgang (2015). "A Lucky Imaging search for stellar sources near 74 transit hosts". Astronomy and Astrophysics. 579. A129. arXiv:1506.05456. Bibcode:2015A&A...579A.129W. doi:10.1051/0004-6361/201526525. S2CID 118903879.