HD 158259

{{Short description|Star in the constellation Draco}} {{Starbox begin | name = [[Henry Draper Catalogue|HD]] 158259 }} {{Starbox observe | epoch = J2000 | constell = [[Draco (constellation)|Draco]]<ref name=xhip/> | ra = {{RA|17|25|24.055}}<ref name=dr3/> | dec = {{DEC|+52|47|26.47}}<ref name=dr3/> | appmag_v = 6.46<ref name=SOPHIE/> }} {{Starbox character | type = [[Main sequence]]{{cn|date=July 2025}} | class = G0<ref name=SOPHIE/> {{nowrap|(G5VmF9<ref name=abt2004/>)}} }} {{Starbox astrometry | radial_v = {{val|13.44|0.14}}<ref name=dr3/> | prop_mo_ra = −90.678<ref name=dr3/> | prop_mo_dec = −49.702<ref name=dr3/> | parallax = 37.0177 | p_error = 0.0199 | parallax_footnote = <ref name=dr3/> | absmag_v = 4.27<ref name=xhip/> }} {{Starbox detail | mass = 0.985<ref name=dr3/> | luminosity = 1.6<ref name=dr3/> | temperature = 6,068<ref name=starhorse2/> | radius = 1.3<ref name=dr3/> | gravity = 4.28<ref name=starhorse2/> | metal_fe = −0.20<ref name=starhorse2/> | rotation = 18 days<ref name=SOPHIE/> | rotational_velocity = 3.0<ref name=glebocki2005/> | age_myr = }} {{Starbox catalog | names = {{odlist |HIP=85268 |2MASS=J17252406+5247263 |TYC=3888-1886-1 |TOI=1462 |GSC=03888-01886 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+158259 | NSTED = HD 158259 }} {{starbox end }}

'''HD 158259''' is a [[main sequence]] star located {{convert|88|ly|pc|lk=on|abbr=off}} away in the northern constellation of [[Draco (constellation)|Draco]]. It hosts a system of at least five planets, discovered by the [[SOPHIE échelle spectrograph]] using the [[radial velocity]] method.<ref name=SOPHIE/>

==Characteristics== HD 158259 is a G0 star with a rotation period of {{val|18|5}} days. More detailed analysis of the spectral assigns a class of G5V, but with the metal lines of an F9 star.<ref name=abt2004/>

==Planets== Five planets have been confirmed orbiting HD 158259, along with one unconfirmed planet. These planets were discovered by N.C. Hara et.al. by the [[radial velocity method]], published in [[Astronomy & Astrophysics]] in April 2020. The innermost planet, HD 158259 b, was also observed to [[astronomical transit|transit]] the star by [[Transiting Exoplanet Survey Satellite|TESS]]. The planets orbit in a nearly 3:2 [[orbital resonance]], with the period ratios 1.5758, 1.5146, 1.5296, 1.5130, and 1.4480, respectively, starting from the innermost pairing. A dynamical analysis has shown that the system is stable. One of the planets, HD 158259 b, is a [[super-Earth]]; the rest, including the unconfirmed HD 158259 g, are [[mini-Neptune]]s.<ref name=SOPHIE/>

{{OrbitboxPlanet begin | table_ref = <ref name=SOPHIE/><ref name=hu2023>{{cite journal|last1=Hardegree-Ullman|first1=K. K.|last2=Christiansen|first2=J. L.|last3=Ciardi|first3=D. R.|last4=Crossfield|first4=I. J. M.|last5=Dressing|first5=C. D.|last6=Livingston|first6=J. H.|last7=Volk|first7=K.|last8=Agol|first8=E.|last9=Barclay|first9=T.|last10=Barentsen|first10=G.|last11=Benneke|first11=B.|last12=Gorjian|first12=V.|last13=Kristiansen|first13=M. H.|title=K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System|journal=The Astronomical Journal|year=2021|volume=161|issue=5|page=219|doi=10.3847/1538-3881/abeab0|arxiv=2102.08978|bibcode=2021AJ....161..219H|s2cid=231951815 |doi-access=free }}</ref> }} {{OrbitboxPlanet | exoplanet = b | mass_earth = 2.2 | radius_earth = ~1.2 | period = 2.177{{±|0.44}} | semimajor = 0.034 | eccentricity = <0.1 | inclination = }} {{OrbitboxPlanet | exoplanet = c | mass_earth = 5.6 | radius_earth = | period = 3.432{{±|0.00002}} | semimajor = 0.046 | eccentricity = <0.1 | inclination = }} {{OrbitboxPlanet | exoplanet = d | mass_earth = 5.4 | radius_earth = | period = 5.198{{±|0.008}} | semimajor = 0.060 | eccentricity = <0.1 | inclination = }} {{OrbitboxPlanet | exoplanet = e | mass_earth = 6.1 | radius_earth = | period = 7.954{{±|0.0016}} | semimajor = 0.080 | eccentricity = <0.1 | inclination = }} {{OrbitboxPlanet | exoplanet = f | mass_earth = 6.1 | radius_earth = | period = 12.03{{±|0.0028}} | semimajor = 0.105 | eccentricity = <0.1 | inclination = }} {{OrbitboxPlanet hypothetical | exoplanet = g | mass_earth = 6.9 | radius_earth = | period = 17.39{{±|0.023}} | semimajor = 0.135 | eccentricity = <0.1 | inclination = }} {{Orbitbox end}}

== See also ==

* [[List of exoplanets discovered in 2020]] - HD 158259 b, c, d, e, and f

==References== <references>

<ref name=SOPHIE>{{cite journal|last1=Hara|first1=N. C.|last2=Bouchy|first2=F.|last3=Stalport|first3=M.|last4=Boisse|first4=I.|last5=Rodrigues|first5=J.|last6=Delisle|first6=J. B.|last7=Santerne|first7=A.|last8=Henry|first8=G. W.|last9=Arnold|first9=L.|last10=Astudillo-Defru|first10=N.|last11=Borgniet|first11=S.|last12=Bonfils|first12=X.|last13=Bourrier|first13=V.|last14=Brugger|first14=B.|last15=Courcol|first15=B.|last16=Dalal|first16=S.|last17=Deleuil|first17=M.|last18=Delfosse|first18=X.|last19=Demangeon|first19=O.|last20=Díaz|first20=R. F.|last21=Dumusque|first21=X.|last22=Forveille|first22=T.|last23=Hébrard|first23=G.|last24=Hobson|first24=M. J.|last25=Kiefer|first25=F.|last26=Lopez|first26=T.|last27=Mignon|first27=L.|last28=Mousis|first28=O.|last29=Moutou|first29=C.|last30=Pepe|first30=F.|last31=Rey|first31=J.|last32=Santos|first32=N. C.|last33=Ségransan|first33=D.|last34=Udry|first34=S.|last35=Wilson|first35=P. A.|title=The SOPHIE search for northern extrasolar planets XVI. HD 158259: A compact planetary system in a near-3:2 mean motion resonance chain|date=March 10, 2020|journal=Astronomy & Astrophysics|volume=636|issue=1|page=L6|doi=10.1051/0004-6361/201937254|arxiv=1911.13296|bibcode=2020A&A...636L...6H|s2cid=208512859}}</ref>

<ref name=abt2004>{{cite journal |bibcode=2004ApJS..155..175A |title=Spectral Classification of Stars in a Supplement to the Bright Star Catalogue |last1=Abt |first1=Helmut A. |journal=The Astrophysical Journal Supplement Series |year=2004 |volume=155 |issue=1 |page=175 |doi=10.1086/423803 |s2cid=121834568 |doi-access=free }}</ref>

<ref name=starhorse2>{{cite journal |bibcode=2022yCat.1354....0A |title=VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022) |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Queiroz |first3=A. B. A. |last4=Chiappini |first4=C. |last5=Ardevol |first5=J. |last6=Casamiquela |first6=L. |last7=Figueras |first7=F. |last8=Jimenez-Arranz |first8=O. |last9=Jordi |first9=C. |last10=Monguio |first10=M. |last11=Romero-Gomez |first11=M. |last12=Altamirano |first12=D. |last13=Antoja |first13=T. |last14=Assaad |first14=R. |last15=Cantat-Gaudin |first15=T. |last16=Castro-Ginard |first16=A. |last17=Enke |first17=H. |last18=Girardi |first18=L. |last19=Guiglion |first19=G. |last20=Khan |first20=S. |last21=Luri |first21=X. |last22=Miglio |first22=A. |last23=Minchev |first23=I. |last24=Ramos |first24=P. |last25=Santiago |first25=B. X. |last26=Steinmetz |first26=M. |journal=Vizier Online Data Catalog |year=2022 }}</ref>

<ref name=glebocki2005>{{cite journal | bibcode=2005yCat.3244....0G | title=VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005) | journal=VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G | volume=3244 | last1=Glebocki | first1=R. | last2=Gnacinski | first2=P. | year=2005 }}</ref>

<ref name=SIMBAD>{{cite web|title=HD 158259|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+158259|publisher=[[SIMBAD]]|accessdate=February 19, 2022}}</ref>

</references>

[[Category:Draco (constellation)]] [[Category:G-type main-sequence stars]] [[Category:Henry Draper Catalogue objects|158259]] [[Category:Hipparcos objects|085268]] [[Category:Planetary systems with five confirmed planets]]