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WASP-59
Observation data; Epoch J2000 Equinox J2000
Constellation	Pegasus
Right ascension	23h 18m 29.5475s
Declination	24° 53′ 21.4364″
Apparent magnitude (V)	12.78
Characteristics
Evolutionary stage	Main sequence
Spectral type	K5V
Astrometry
Radial velocity (Rv)	-56.82 km/s
Proper motion (μ)	RA: 33.729 mas/yr ; Dec.: −2.522 mas/yr
Parallax (π)	8.5968 ± 0.0421 mas
Distance	379 ± 2 ly ; (116.3 ± 0.6 pc)
Details
Mass	0.719±0.035 M☉
Radius	0.613±0.044 R☉
Temperature	4650±150 K
Metallicity [Fe/H]	-0.15±0.11 dex
Rotational velocity (v sin i)	2.3±1.5 km/s
Age	7±7 Gyr
Other designations
	Gaia DR2 2841043011433969152, 2MASS J23182955+2453214
Database references
SIMBAD	data

WASP-59 is a K-type main-sequence star about 379 light-years away. The star's age is essentially unconstrained by observations. WASP-59 is slightly depleted in heavy elements, having 70% of the solar abundance of iron.^[2] The star produces extremely low levels of ultraviolet light, indicating an absence of flare activity.^[4]

A multiplicity survey in 2015 did not detect any stellar companions to WASP-59.^[5]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, mildly eccentric orbit.^[6]

Its equilibrium temperature is 670±35 K.^[6] The planet is unusually dense for a gas giant, representing an outlier on a mass-radius diagram.^[7]

The WASP-59 planetary system^[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.857^+0.046 _−0.047 $M$ _J	0.0697±0.0011	7.919585±0.000010	0.101^+0.046 _−0.048	89.27±0.52°	0.775±0.068 $R$ _J

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c 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 at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy & Astrophysics, 602: A107, arXiv:1704.00373, Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID 118923163
^ "WASP-59". SIMBAD. Centre de données astronomiques de Strasbourg.
^ Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal, 766 (1): 9, arXiv:1301.6192, Bibcode:2013ApJ...766....9S, doi:10.1088/0004-637X/766/1/9, S2CID 118415788
^ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579
^ ^a ^b Hébrard, G.; Collier Cameron, A.; Brown, D. J. A.; Díaz, R. F.; Faedi, F.; Smalley, B.; Anderson, D. R.; Armstrong, D.; Barros, S. C. C.; Bento, J.; Bouchy, F.; Doyle, A. P.; Enoch, B.; Gómez Maqueo Chew, Y.; Hébrard, É. M.; Hellier, C.; Lendl, M.; Lister, T. A.; Maxted, P. F. L.; McCormac, J.; Moutou, C.; Pollacco, D.; Queloz, D.; Santerne, A.; Skillen, I.; Southworth, J.; Tregloan-Reed, J.; Triaud, A. H. M. J.; Udry, S.; et al. (2012), "WASP-52b, WASP-58b, WASP-59b, and WASP-60b: four new transiting close-in giant planets", Astronomy & Astrophysics, 549: A134, arXiv:1211.0810, doi:10.1051/0004-6361/201220363, S2CID 54502046
^ Southworth, J.; Mancini, L.; Browne, P.; Burgdorf, M.; Calchi Novati, S.; Dominik, M.; Gerner, T.; Hinse, T. C.; Jorgensen, U. G.; Kains, N.; Ricci, D.; Schafer, S.; Schonebeck, F.; Tregloan-Reed, J.; Alsubai, K. A.; Bozza, V.; Chen, G.; Dodds, P.; Dreizler, S.; Fang, X. -S.; Finet, F.; Gu, S. -H.; Hardis, S.; Harpsoe, K.; Henning, Th.; Hundertmark, M.; Jessen-Hansen, J.; Kerins, E.; Kjeldsen, H.; et al. (2013), "High-precision photometry by telescope defocussing. V. WASP-15 and WASP-16", Monthly Notices of the Royal Astronomical Society, 434 (2): 1300–1308, arXiv:1306.3509, doi:10.1093/mnras/stt1089, S2CID 53645606