{{Short description|F-class main sequence star in the constellation Cetus}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = Cetus<ref name="Roman1987"/> | ra = {{RA|01|57|03.204}}<ref name=GaiaDR3/> | dec = {{DEC|+00|45|31.88}}<ref name=GaiaDR3/> | appmag_v = 10.56<ref name=Høg_et_al_2000>{{Cite journal | title=The Tycho-2 catalogue of the 2.5{{nbsp}}million brightest stars | last1=Høg | first1=E. | last2=Fabricius | first2=C. | last3=Makarov | first3=V. V. | last4=Urban | first4=S. | last5=Corbin | first5=T. | last6=Wycoff | first6=G. | last7=Bastian | first7=U. | last8=Schwekendiek | first8=P. | last9=Wicenec | first9=A. | display-authors=1 | journal=Astronomy and Astrophysics | volume=355 | page=L27 | date=2000 | bibcode=2000A&A...355L..27H | doi=10.1888/0333750888/2862 | isbn=978-0333750889 }}</ref> }} {{Starbox character | type = main sequence<ref name=GaiaDR3/> | class = F8<ref name=Smith2012/> | b-v = 0.896<ref name=Høg_et_al_2000/> }} {{Starbox astrometry | radial_v = 7.690{{±|0.004}}<ref name=GaiaDR2>{{Cite Gaia DR2|2507901914613005056}}</ref> | prop_mo_ra = 23.418 | prop_mo_dec = −6.844 | pm_footnote = <ref name=GaiaDR3>{{Cite Gaia DR3|2507901914613201024}}</ref> | parallax = 2.8158 | p_error = 0.0265 | parallax_footnote = <ref name=GaiaDR3/> }} {{Starbox detail | source = <ref name=Brown2016/> | mass = 1.53{{±|0.07|0.06}} | radius = 2.17{{±|0.18|0.10}} | gravity = 3.944{{±|0.036|0.050}} | luminosity = | temperature = 6,050{{±|100}} | metal_fe = 0.15{{±|0.07}} | rotation = | rotational_velocity = 7.8{{±|0.3}} | age_gyr = 3.6{{±|1.6|1.0}} }} {{Starbox catalog | names = {{odlist | name=Mpingo | BD=+00 316 | TIC=422655579 | TOI=388 | TYC=30-116-1 | WASP=71 | 2MASS=J01570320+0045318}}<ref name=simbad/> }} {{Starbox reference | Simbad = WASP-71 | NSTED = WASP-71 }} {{Starbox end}}
'''WASP-71''', also named '''Mpingo''', is an ordinary star with a close-orbiting planetary companion in the equatorial constellation of Cetus. With an apparent visual magnitude of 10.56,<ref name=Høg_et_al_2000/> it is too faint to be visible to the naked eye. This star is located at a distance of 1,160 light-years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 7.7 km/s.<ref name=GaiaDR2/>
This is classified as an F-type star with a stellar classification of F8.<ref name=Smith2012/> It is more than double the diameter of the Sun with 1.5 times the Sun's mass. The star is younger than the Sun at about 3.6 billion years,<ref name=Brown2016/> yet is already evolving away from the main sequence.<ref name=Smith2012/> BD+00 316 is enriched in heavy elements, having 140% of the solar abundance of iron.<ref name=Brown2016/> Imaging surveys in 2015 and 2020 failed to find any stellar companions for BD+00 316.<ref>{{citation|arxiv=1506.05456|title=A Lucky Imaging search for stellar sources near 74 transit hosts|year=2015|doi=10.1051/0004-6361/201526525|last1=Wöllert|first1=Maria|last2=Brandner|first2=Wolfgang|journal=Astronomy & Astrophysics|volume=579|pages=A129|bibcode=2015A&A...579A.129W |s2cid=118903879}}</ref><ref>{{citation|arxiv=2001.08224|title=A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE|year=2020|doi=10.1051/0004-6361/201937127|last1=Bohn|first1=A. J.|last2=Southworth|first2=J.|last3=Ginski|first3=C.|last4=Kenworthy|first4=M. A.|last5=Maxted|first5=P. F. L.|last6=Evans|first6=D. F.|journal=Astronomy & Astrophysics|volume=635|pages=A73|bibcode=2020A&A...635A..73B |s2cid=210861118}}</ref>
==Nomenclature== The designation ''WASP-71'' comes from the Wide Angle Search for Planets and has been used since 2012;<ref name=Smith2012/> ''BD+00 316'' is the stellar identifier from the ''Bonner Durchmusterung'' catalogue.<ref name=simbad/>
The star was named Mpingo by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mpingo tree (''Dalbergia melanoxylon'') whose wood is a type of ebony used in musical instruments.<ref name=naming/>
==Planetary system== In 2012 a transiting superjovian planet, designated WASP-71b, was detected on a tight, circular orbit.<ref name=Smith2012>{{citation|arxiv=1211.3045|title=WASP-71b: a bloated hot Jupiter in a 2.9-day, prograde orbit around an evolved F8 star|year=2013|doi=10.1051/0004-6361/201220727|last1=Smith|first1=A. M. S.|last2=Anderson|first2=D. R.|last3=Bouchy|first3=F.|last4=Collier Cameron|first4=A.|last5=Doyle|first5=A. P.|last6=Fumel|first6=A.|last7=Gillon|first7=M.|last8=Hébrard|first8=G.|last9=Hellier|first9=C.|last10=Jehin|first10=E.|last11=Lendl|first11=M.|last12=Maxted|first12=P. F. L.|last13=Moutou|first13=C.|last14=Pepe|first14=F.|last15=Pollacco|first15=D.|last16=Queloz|first16=D.|last17=Santerne|first17=A.|last18=Segransan|first18=D.|last19=Smalley|first19=B.|last20=Southworth|first20=J.|last21=Triaud|first21=A. H. M. J.|last22=Udry|first22=S.|last23=West|first23=R. G.|journal=Astronomy & Astrophysics|volume=552|pages=A120|bibcode=2013A&A...552A.120S |s2cid=118575479}}</ref> The planetary orbit is well aligned with the equatorial plane of the star, the misalignment angle being equal to −1.9{{±|7.1|7.5}}°.<ref name=Brown2016>{{citation|arxiv=1610.00600|title=Rossiter–McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems|year=2016|doi=10.1093/mnras/stw2316|last1=Brown|first1=D. J. A.|last2=Triaud|first2=A. H. M. J.|last3=Doyle|first3=A. P.|last4=Gillon|first4=M.|last5=Lendl|first5=M.|last6=Anderson|first6=D. R.|last7=Collier Cameron|first7=A.|last8=Hébrard|first8=G.|last9=Hellier|first9=C.|last10=Lovis|first10=C.|last11=Maxted|first11=P. F. L.|last12=Pepe|first12=F.|last13=Pollacco|first13=D.|last14=Queloz|first14=D.|last15=Smalley|first15=B.|journal=Monthly Notices of the Royal Astronomical Society|volume=464|issue=1 |pages=810–839|doi-access=free |bibcode=2017MNRAS.464..810B |s2cid=53497449}}</ref> Its equilibrium temperature is 2,016.1{{±|67.0|52.5}} K.<ref name=Brown2016/>
The planet was named ''Tanzanite'' by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mineral also known as tanzanite.<ref name=naming>[https://wasp-planets.net/2020/01/05/the-iau-announces-names-for-wasp-exoplanets/ The IAU announces names for WASP exoplanets]</ref>
{{OrbitboxPlanet begin | name = WASP-71 | table_ref = <ref name=Brown2016/> }} {{OrbitboxPlanet | exoplanet = b (Tanzanite) | mass = 2.14{{±|0.08}} | radius = 1.35{{±|0.13|0.07}} | semimajor = 0.0460{{±|0.0006}} | period = 2.903676{{±|0.000008}} | eccentricity = <0.019<ref>{{citation|arxiv=1704.00373|title=The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets|year=2017|doi=10.1051/0004-6361/201629882|last1=Bonomo|first1=A. S.|last2=Desidera|first2=S.|last3=Benatti|first3=S.|last4=Borsa|first4=F.|last5=Crespi|first5=S.|last6=Damasso|first6=M.|last7=Lanza|first7=A. F.|last8=Sozzetti|first8=A.|last9=Lodato|first9=G.|last10=Marzari|first10=F.|last11=Boccato|first11=C.|last12=Claudi|first12=R. U.|last13=Cosentino|first13=R.|last14=Covino|first14=E.|last15=Gratton|first15=R.|last16=Maggio|first16=A.|last17=Micela|first17=G.|last18=Molinari|first18=E.|last19=Pagano|first19=I.|last20=Piotto|first20=G.|last21=Poretti|first21=E.|last22=Smareglia|first22=R.|last23=Affer|first23=L.|last24=Biazzo|first24=K.|last25=Bignamini|first25=A.|last26=Esposito|first26=M.|last27=Giacobbe|first27=P.|last28=Hébrard|first28=G.|last29=Malavolta|first29=L.|last30=Maldonado|first30=J.|journal=Astronomy & Astrophysics|volume=A107|page=602|bibcode=2017A&A...602A.107B |s2cid=118923163|display-authors=29}}</ref> | inclination = 85.8{{±|2.4|2.1}} }} {{Orbitbox end}}
==References== {{Reflist|refs=
<ref name="Roman1987">{{Cite constellation|WASP-71}}</ref>
<ref name=simbad>{{cite simbad |title=BD+00 316}}</ref>
}}
{{Sky|01|57|03.2041|+|00|45|31.8789}}
{{Cetus}}
<!-- Properties --> Category:F-type main-sequence stars Category:Planetary systems with one confirmed planet Category:Planetary transit variables <!-- Location/Catalogues --> Category:Cetus BD+00 0316 Mpingo 0388 071 Category:Population I stars