WASP-56

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	G6[3]
Astrometry
Proper motion (μ)	RA: −36.262±0.810[1] mas/yr ; Dec.: 0.871±0.590[1] mas/yr
Parallax (π)	3.86 ± 0.32[1] mas
Distance	840 ± 70 ly ; (260 ± 20 pc)
Details[4]
Mass	1.03 ± 0.07 M☉
Radius	0.99 ± 0.13 R☉
Surface gravity (log g)	4.45 ± 0.1 cgs
Temperature	5600 ± 100 K
Rotational velocity (v sin i)	1.5 ± 0.9 km/s
Other designations
	Melotte 111 AV 561, TYC 1986-1561-1
Database references
SIMBAD	data

WASP-56 is a sun-like star of spectral type G6 in the constellation of Coma Berenices.[5] 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.[6]

It has a surface temperature of 5600 ± 100 K and is around 1.03 times as massive as the Sun and 0.99 times its radius.[4]

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[4]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.571+0.034 −0.035 M_J	0.05458±0.00041	4.617101+0.000001 −0.000002	0 (fixed)	88.5+0.1 −0.2°	1.092+0.035 −0.033 R_J

References

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.Gaia Data Release 1 catalog entry
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.
"Cl* Melotte 111 AV 561". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 September 2013.
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.
"Coma Berenices, constellation boundary". The Constellations. International Astronomical Union. Retrieved 27 February 2014.
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.

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[Gaia2016-1] 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.Gaia Data Release 1 catalog entry

[TYC2-2] 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.

[SIMBAD-3] "Cl* Melotte 111 AV 561". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 September 2013.

[Faedi-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.

[boundary-5] "Coma Berenices, constellation boundary". The Constellations. International Astronomical Union. Retrieved 27 February 2014.

[Wöllert2015-6] 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.