WASP-56

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]

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
Distance840 ± 70 ly
(260 ± 20 pc)
Details[4]
Mass1.03 ± 0.07 M☉
Radius0.99 ± 0.13 R☉
Surface gravity (log g)4.45 ± 0.1 cgs
Temperature5600 ± 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
SIMBADdata

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 MJ		 0.05458±0.00041 4.617101+0.000001
−0.000002		 0 (fixed) 88.5+0.1
−0.2°		 1.092+0.035
−0.033 RJ
gollark: Odd specificity indeed.
gollark: Paper isn't that tasty...
gollark: Now to figure out what to do with my large pile of unbreedables.
gollark: Are bakikals or whatever rare? They seem to be in high demand.
gollark: The market prizes thread continues to be a bit of a salt inferno.

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