WASP-20

WASP-20

WASP-20, as seen during the Digitized Sky Survey
Object type	Binary star (Type F9V)[1]
Other designations	2MASS J00203853-2356086, GSC 06413-00439, PPM 723532, Gaia DR2 2359978293136820864, RAVE J002038.5-235609, Gaia DR3 2359978293137038720, TOI-194, TIC 211438925, UCAC4 331-000391, TYC 6413-439-1
Observation data (Epoch J2000)
Constellation	Cetus[2]
Right ascension	00^h 20^m 38.53504^s[3]
Declination	−23° 56′ 08.6028″[3]
Distance	~900 ly
Apparent magnitude	9.701 ±0.021, 9.417 ±0.021, 9.39 ±0.024, 11.388 ±0.051, 10.779 ±0.017, 11.034 ±0.012, 10.62 ±0.022, 10.485 ±0.053, 10.839109 ±0.01, 10.765 ±0.04
Temperature	5940±100

WASP-20, also known as CD-24 102, is a binary star^[1] system in the equatorial constellation Cetus, located at a distance of about 940 light-years (290 parsecs) from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.^[5]

Stellar properties

WASP-20 is a star of spectral type F9, aged 7+2
−1 billion years. Its mass is 1.200 ± 0.041 solar masses for a radius of 1.392 ± 0.044 solar radii, or a density of 0.630 ± 0.046 grams per cubic centimeter.^[6]

Planetary system

WASP-20b is a transiting hot Jupiter discovered in 2014.^[6] WASP-20b orbits WASP-20 in less than five Earth days very close to its star (0.06 AU) in a circular (near-zero eccentricity) orbit. The orbit is inclined by 85.56 ± 0.22° relative to the plane of the sky and is thus edge-on, as necessary for a transit to be observed.^[7]

The WASP-20 planetary system^[7]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.311+0.019 −0.018 MJ	0.05999+0.00069 −0.00068	4.8996284(33)	<0.039	85.56±0.22°	1.462±0.059 RJ

See also

• Wide Angle Search for Planets
• Lists of planets

References

1. Evans, Daniel F.; Southworth, John; Smalley, Barry (December 2016). "WASP-20 Is a Close Visual Binary with a Transiting Hot Jupiter". The Astrophysical Journal Letters. 833 (2): L19. arXiv:1611.08735. Bibcode:2016ApJ...833L..19E. doi:10.3847/2041-8213/833/2/L19.
2. "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
3. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
4. "CD-24 102". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 April 2024.
5. "WASP-20 | NASA Exoplanet Archive".
6. Anderson, D. R.; Collier Cameron, A.; et al. (March 2015). "WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars". Astronomy & Astrophysics. 575: A61. arXiv:1402.1482. Bibcode:2015A&A...575A..61A. doi:10.1051/0004-6361/201423591.
7. Bonomo, A. S.; Desidera, S.; et al. (June 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.