{{Short description|G-type star in the constellation Centaurus}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = [[Centaurus]]<ref name=Anderson2012/> | ra = {{RA|13|29|21.11291}}<ref name=GaiaDR3/> | dec = {{DEC|−35|34|15.5880}}<ref name=GaiaDR3/> | appmag_v = 7.240<ref name=Barbato2018/> }} {{Starbox character | type = [[main sequence]]<ref name=GaiaDR3/> | class = G7IV-V<ref name=Gray2006/> | b-v = {{Val|0.727|0.014}}<ref name=Barbato2018/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{Val|−17.43|0.09}}<ref name=Anderson2012/> | prop_mo_ra = {{val|−205.904}} | prop_mo_dec = {{val|−71.402}} | pm_footnote = <ref name=GaiaDR3/> | parallax = 30.9440 | p_error = 0.0256 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = 4.67<ref name=Anderson2012/> }} {{Starbox detail | source = <ref name=Barbato2018/> | mass = {{Val|1.053|0.028}} | radius = {{Val|1.074|0.041}} | luminosity = {{Val|1.163|0.002|0.003}}<ref name=GaiaDR2/> | gravity = {{Val|4.371|0.039}} | temperature = {{Val|5732|53|fmt=commas}} | metal_fe = {{Val|0.19|0.03}} | rotational_velocity = | age_gyr = {{Val|4.192|2.274}}<ref name=Barbato2018/> }} {{Starbox catalog | names = {{odlist | CPD=−34°8913 | HD=117207 | HIP=65808 | SAO=204517 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+117207 | EPE = HD+117207 }} {{End}}

'''HD 117207''' is a [[star]] in the southern [[constellation]] [[Centaurus]]. With an [[apparent visual magnitude]] of 7.24,<ref name=Barbato2018/> it is too dim to be visible to the naked eye but can be seen with a small telescope. Based upon [[stellar parallax|parallax]] measurements, it is located at a distance of {{convert|105.4|ly|pc|lk=on|abbr=off}} from the [[Sun]]. The star is drifting closer with a [[radial velocity]] of −17.4&nbsp;km/s.<ref name=Anderson2012/> It has an [[absolute magnitude]] of 4.67.<ref name=Anderson2012/>

This object has a [[stellar classification]] of G7IV-V,<ref name=Gray2006/> showing blended [[stellar spectrum|spectral traits]] of a [[G-type main-sequence star]] and an older, [[stellar evolution|evolving]] [[subgiant star]]. It is around four<ref name=Barbato2018/>&nbsp;billion years old with 5%<ref name=Luck2018/> greater mass than the Sun and a 7% larger radius.<ref name=GaiaDR2/> The star is radiating 1.16 times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of 5,644&nbsp;K.<ref name=GaiaDR2/>

In 2005, a planet was found orbiting the star using the [[radial velocity method]], and was designated [[HD 117207 b]].<ref name="Marcy2005"/><ref name="Butler2006"/> The [[orbital elements]] of this planet were refined in 2018, showing an [[orbital period]] of {{Convert|2621.75|days|years|2|disp=out|abbr=off}}, a [[semimajor axis]] of {{Val|3.79|ul=AU}}, and an [[orbital eccentricity|eccentricity]] of 0.16. The [[minimum mass]] of this object is nearly double that of [[Jupiter]]. If an inner planet is orbiting the star, it must have an orbital period no greater than {{Convert|1263.5|days|years|2|disp=out|abbr=off}} to satisfy Hill's criteria for dynamic stability.<ref name=Barbato2018/> In 2023, the inclination and true mass of HD 117207 b were determined via [[astrometry]].<ref name="Xiao2023"/>

{{OrbitboxPlanet begin | table_ref = <ref name="Xiao2023"/> | period_unit = year }} {{OrbitboxPlanet | exoplanet = [[HD 117207 b|b]] | mass = {{val|2.106|0.16|0.089}} | period = {{val|7.136|0.034|0.035}} | semimajor = {{val|3.773|0.036|0.035}} | eccentricity = {{val|0.04|0.026|0.024}} | inclination = {{val|76.6|9.3|12.0}} or {{val|103.4|12.0|9.3}} }} {{Orbitbox end}}

== See also == * [[HD 117618]] * [[List of extrasolar planets]]

==References== {{Reflist|refs=

<ref name=GaiaDR2>{{Cite Gaia DR2|6166183842771027328}}</ref> <ref name=GaiaDR3>{{Cite Gaia DR3|6166183842771027328}}</ref>

<ref name=SIMBAD>{{cite simbad | title=HD 117207 | access-date=2018-07-23}}</ref>

<ref name=Anderson2012>{{cite XHIP|65808}}</ref>

<ref name=Luck2018>{{cite journal | title=Abundances in the Local Region. III. Southern F, G, and K Dwarfs | last1=Luck | first1=R. Earle | journal=The Astronomical Journal | volume=155 | issue=3 | id=111 | pages=31 | date=March 2018 | doi=10.3847/1538-3881/aaa9b5 | bibcode=2018AJ....155..111L | s2cid=125765376 | doi-access=free }}</ref>

<ref name=Gray2006>{{cite journal | display-authors=1 | last1=Gray | first1=R. O. | first2=C. J. | last2=Corbally | first3=R. F. | last3=Garrison | first4=M. T. | last4=McFadden | first5=P. E. | last5=Robinson | title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I | journal=The Astronomical Journal | volume=132 | issue=1 | pages=161–170 | date=July 2006 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 | s2cid=119476992 }}</ref>

<ref name=Barbato2018>{{cite journal | title=Exploring the realm of scaled solar system analogues with HARPS | display-authors=1 | last1=Barbato | first1=D. | last2=Sozzetti | first2=A. | last3=Desidera | first3=S. | last4=Damasso | first4=M. | last5=Bonomo | first5=A. S. | last6=Giacobbe | first6=P. | last7=Colombo | first7=L. S. | last8=Lazzoni | first8=C. | last9=Claudi | first9=R. | last10=Gratton | first10=R. | last11=LoCurto | first11=G. | last12=Marzari | first12=F. | last13=Mordasini | first13=C. | journal=Astronomy & Astrophysics | volume=615 | id=A175 | pages=21 | date=August 2018 | doi=10.1051/0004-6361/201832791 | arxiv=1804.08329 | bibcode=2018A&A...615A.175B | s2cid=119099721 }}</ref>

<ref name="Butler2006">{{cite journal | title=Catalog of Nearby Exoplanets | last1=Butler | first1=R. P. | last2=Wright | first2=J. T. | last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A. | last5=Vogt | first5=S. S. | last6=Tinney | first6=C. G. | last7=Jones | first7=H. R. A. | last8=Carter | first8=B. D. | last9=Johnson | first9=J. A. | display-authors=1 | journal=The Astrophysical Journal | volume=646 | issue=1 | pages=505–522 | year=2006 | arxiv=astro-ph/0607493 | bibcode=2006ApJ...646..505B | doi=10.1086/504701 | s2cid=119067572 }}</ref>

<ref name="Marcy2005">{{cite journal | title=Five New Extrasolar Planets | last1=Marcy | first1=Geoffrey W. | last2=Butler | first2=R. Paul | last3=Vogt | first3=Steven S. | last4=Fischer | first4=Debra A. | last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Greg | last7=Wright | first7=Jason T. | last8=Johnson | first8=John A. | display-authors=1 | journal=The Astrophysical Journal | volume=619 | issue=1 | pages=570–584 | year=2005 | bibcode=2005ApJ...619..570M | doi=10.1086/426384 | citeseerx=10.1.1.516.6667 | s2cid=5803173 }}</ref>

<ref name="Xiao2023">{{cite journal |last1=Xiao |first1=Guang-Yao |last2=Liu |first2=Yu-Juan |display-authors=etal |date=May 2023 |title=The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements |journal=[[Research in Astronomy and Astrophysics]] |volume=23 |issue=5 |pages=055022 |doi=10.1088/1674-4527/accb7e |arxiv=2303.12409 |bibcode=2023RAA....23e5022X}}</ref>

}}

{{Sky|13|29|21.1137|-|35|34|15.589|108}} {{Stars of Centaurus}}

[[Category:G-type main-sequence stars]] [[Category:Planetary systems with one confirmed planet]] [[Category:Centaurus]] [[Category:Durchmusterung objects|CD-34 08913]] [[Category:Henry Draper Catalogue objects|117207]] [[Category:Hipparcos objects|065808]]