{{Short description|Star in the constellation Cetus}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = Cetus<ref name="Roman1987"/> | ra = {{RA|00|20|38.53504}}<ref name="GaiaDR3"/> | dec = {{DEC|-23|56|08.6028}}<ref name="GaiaDR3"/> | appmag_v = 10.779<ref name="SIMBAD"/> }} {{Starbox character | type = main sequence<ref name="Bonomo2017"/> | class = F9V<ref name="Evans2016"/> }} {{Starbox astrometry | radial_v = {{val|1.26|0.85}}<ref name="GaiaDR3"/> | prop_mo_ra = +1.352 | prop_mo_dec = −14.739 | pm_footnote = <ref name="GaiaDR3"/> | parallax = 3.4699 | p_error = 0.7095 | parallax_footnote = <ref name="GaiaDR3"/> | absmag_v = | absmag_bol = }} {{Starbox detail | mass = 1.09<ref name="Bonomo2017"/> | radius = 1.14<ref name="Bonomo2017"/> | luminosity = | gravity = 4.36<ref name="Bonomo2017"/> | temperature = {{val|fmt=commas|5940|100}}<ref name="Bonomo2017"/> | metal_fe = {{val|−0.008|0.060}}<ref name="Bonomo2017"/> | rotation = | rotational_velocity = {{val|4.75|0.51}}<ref name="Bonomo2017"/> | age_gyr = 3.6<ref name="Bonomo2017"/> }} {{Starbox catalog | names = {{odlist | 2MASS=J00203853-2356086 | CD=-24 102 | GSC=06413-00439 | TIC=211438925 | TOI=194 | TYC=6413-439-1 | WASP=20}}<ref name="SIMBAD"/> }} {{Starbox reference | Simbad = CD-24+102 | NSTED = WASP-20 }} {{Starbox end}}

'''WASP-20''', also known as '''CD-24 102''', is a binary star<ref name="Evans2016"/> system in the equatorial constellation Cetus, located at a distance of about {{convert|940|ly|pc|lk=on|abbr=off}} from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.<ref>{{Cite web |title=WASP-20 {{!}} NASA Exoplanet Archive |url=https://exoplanetarchive.ipac.caltech.edu/overview/wasp%2020%20b#overview}}</ref>

== Stellar properties == WASP-20 is a star of spectral type F9, aged 3.6 billion years. Its mass is {{val|10.09|0.05|0.02|u=solar masses}} for a radius of {{val|1.14|0.08|0.01|u=solar radii}}, or a density of {{val|0.73|0.17|u=grams per cubic centimeter}}.<ref name="Bonomo2017"/>

== Planetary system == WASP-20b is a transiting hot Jupiter discovered in 2014.<ref name="Anderson2015"/> 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 {{val|85.56|0.22|u=°}} relative to the plane of the sky and is thus edge-on, as necessary for a transit to be observed.<ref name="Bonomo2017"/>

{{Orbitbox planet begin | name = WASP-20 | table_ref = <ref name="Bonomo2017"/> }} {{Orbitbox planet | exoplanet = b | mass = {{val|0.311|0.019|0.018}} | radius = {{val|1.462|0.059}} | semimajor = {{val|0.05999|0.00069|0.00068}} | period = {{val|4.8996284|(33)}} | eccentricity = <0.039 | inclination = {{val|85.56|0.22}} }} {{Orbitbox end}}

== See also ==

* Wide Angle Search for Planets * Lists of planets

== References == <references>

<ref name="SIMBAD">{{cite simbad |title=CD-24 102 |access-date=16 April 2024}}</ref>

<ref name="GaiaDR3">{{Cite Gaia DR3|2359978293137038720}}</ref>

<ref name="Anderson2015">{{cite journal |last1=Anderson |first1=D. R. |last2=Collier Cameron |first2=A. |display-authors=etal |date=March 2015 |title=WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars |journal=Astronomy & Astrophysics |volume=575 |issue= |pages=A61 |doi=10.1051/0004-6361/201423591 |arxiv=1402.1482 |bibcode=2015A&A...575A..61A}}</ref>

<ref name="Evans2016">{{cite journal |last1=Evans |first1=Daniel F. |last2=Southworth |first2=John |last3=Smalley |first3=Barry |date=December 2016 |title=WASP-20 Is a Close Visual Binary with a Transiting Hot Jupiter |journal=The Astrophysical Journal Letters |volume=833 |issue=2 |pages=L19 |doi=10.3847/2041-8213/833/2/L19 |doi-access=free |arxiv=1611.08735 |bibcode=2016ApJ...833L..19E}}</ref>

<ref name="Bonomo2017">{{cite journal |last1=Bonomo |first1=A. S. |last2=Desidera |first2=S. |display-authors=etal |date=June 2017 |title=The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets |journal=Astronomy & Astrophysics |volume=602 |issue= |pages=A107 |doi=10.1051/0004-6361/201629882 |arxiv=1704.00373 |bibcode=2017A&A...602A.107B}}</ref>

<ref name="Roman1987">{{Cite constellation|WASP-20}}</ref>

</references>

{{Cetus}}

Category:Cetus Category:Binary stars Category:F-type main-sequence stars Category:Planetary systems with one confirmed planet CD-24 00102 194 20