HD 139357

{{Short description|K-type giant star in the constellation Draco}} {{Starbox begin}} {{Starbox observe | epoch = J2000.0 | constell = [[Draco (constellation)|Draco]]<ref name=Anderson_Francis_2012/> | ra = {{RA|15|35|16.19859}}<ref name=GaiaDR3/> | dec = {{DEC|+53|55|19.7094}}<ref name=GaiaDR3/> | appmag_v = 5.97<ref name=Anderson_Francis_2012/> }} {{Starbox character | type = [[red giant branch]]<ref name=GaiaDR3/> | class = K4III<ref name=Maldonado_et_al_2019/> | b-v = {{val|1.184|0.006}}<ref name=Anderson_Francis_2012/> | u-b = | variable = }} {{Starbox astrometry | radial_v = {{val|-8.53|0.13}}<ref name=GaiaDR3/> | prop_mo_ra = {{val|-18.845|0.051}} | prop_mo_dec = {{val|2.097|0.063}} | pm_footnote = <ref name=GaiaDR3/> | parallax = 8.8114 | p_error = 0.0460 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = 0.61<ref name=Anderson_Francis_2012/> }} {{Starbox detail | source = | mass = {{val|1.1|0.1|u=solar mass}}<ref name=Bonfanti_et_al_2016/> {{val|1.35|0.24|u=solar mass}}<ref name=Döllinger_et_al_2009/> {{val|2.16|0.18}}<ref name=Maldonado_et_al_2019/> | radius = {{val|11.47|0.75|u=solar radius}}<ref name=Döllinger_et_al_2009/> {{val|14.4|0.4}}<ref name=Maldonado_et_al_2019/> | gravity = {{val|2.2|0.1|u=cgs}}<ref name=Bonfanti_et_al_2016/> {{val|2.63|0.10|u=cgs}}<ref name=Maldonado_Villaver_2016/> {{val|2.9|0.15}}<ref name=Döllinger_et_al_2009/> | luminosity = {{val|74|1}}<ref name=Bonfanti_et_al_2016/> | temperature = {{val|4601|28|fmt=commas}}<ref name=Maldonado_Villaver_2016/> | metal_fe = {{val|−0.13|0.05|u=dex}}<ref name=Döllinger_et_al_2009/> {{val|0.34|0.05}}<ref name=Maldonado_et_al_2019/> | age_gyr = {{val|1.19|0.33|u=Gyr}}<ref name=Maldonado_Villaver_2016/> {{val|3.07|1.47|u=Gyr}}<ref name=Maldonado_et_al_2019/> {{val|7.20|1.80}}<ref name=Bonfanti_et_al_2016/> | rotational_velocity = }} {{Starbox catalog | names = {{odlist | BD=+54°1756 | GC=20977 | GCRV=9003 | HD=139357 | HIP=76311 | HR=5811 | PPM=35043 | SAO=29583 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+139357 | NSTED = HD 139357 | EPE = HD+139357 }} {{Starbox end}}

'''HD 139357''' is a 6th [[apparent magnitude|magnitude]] [[K-type star|K-type]] [[giant star|giant]] [[star]] located approximately 370 [[light year]]s from Earth, visible in the [[constellation]] [[Draco (constellation)|Draco]]. Its mass is four thirds that of the [[Sun]] but its radius is 11.47 times larger. However, despite being a giant star, it is only 3.07 billion years old, which is younger than the Sun.

It hosts a substellar companion with a [[minimum mass]] of {{Jupiter mass|9.76|link=y}}, discovered in 2009.<ref name=Döllinger_et_al_2009/> A 2022 study estimated the true mass of HD 139357 b at about {{Jupiter mass|16.38}} via [[astrometry]], although this estimate is poorly constrained. If this is the true mass, the object would be a [[brown dwarf]].<ref name="Feng2022"/>

{{OrbitboxPlanet begin | table_ref = <ref name=Döllinger_et_al_2009/> }} {{OrbitboxPlanet | exoplanet = [[HD 139357 b|b]] | mass = ≥9.76 ± 2.15 | period = 1125.7 ± 9 | semimajor = 2.36 ± 0.02 | eccentricity = 0.10 ± 0.02 }} {{Orbitbox end}}

== See also == * [[42 Draconis]] * [[Iota Draconis]] * [[List of extrasolar planets]]

== References == {{Reflist|colwidth=30em|refs=

<ref name=SIMBAD>{{cite simbad | title=HD 139357 | access-date=2021-01-11 }}</ref>

<ref name=Bonfanti_et_al_2016>{{cite journal | title=Age consistency between exoplanet hosts and field stars | last1=Bonfanti | first1=A. | last2=Ortolani | first2=S. | last3=Nascimbeni | first3=V. | journal=Astronomy & Astrophysics | year=2016 | volume=585 | id=A5 | pages=14 | arxiv=1511.01744 | bibcode=2016A&A...585A...5B | doi=10.1051/0004-6361/201527297 | s2cid=53971692 }}</ref>

<ref name=Maldonado_Villaver_2016>{{cite journal | title=Evolved stars and the origin of abundance trends in planet hosts | last1=Maldonado | first1=J. | last2=Villaver | first2=E. | journal=Astronomy & Astrophysics | volume=588 | id=A98 | pages=11 | date=April 2016 | arxiv=1602.00835 | bibcode=2016A&A...588A..98M | doi=10.1051/0004-6361/201527883 | s2cid=119212009 }}</ref>

<ref name=Maldonado_et_al_2019>{{cite journal | title=Connecting substellar and stellar formation: the role of the host star's metallicity | last1=Maldonado | first1=J. | last2=Villaver | first2=E. | last3=Eiroa | first3=C. | last4=Micela | first4=G. | display-authors=1 | journal=Astronomy & Astrophysics | volume=624 | id=A94 | pages=7 | date=April 2019 | arxiv=1903.01141 | bibcode=2019A&A...624A..94M | doi=10.1051/0004-6361/201833827 | s2cid=118934484 }}</ref>

<ref name=Döllinger_et_al_2009>{{cite journal | title=Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357 | url=http://www.aanda.org/articles/aa/full_html/2009/21/aa10837-08/aa10837-08.html | last1=Döllinger | first1=M. P. | last2=Hatzes | first2=A. P. | last3=Pasquini | first3=L. | last4=Guenther | first4=E. W. | last5=Hartmann | first5=M. | last6=Girardi | first6=L. | display-authors=1 | journal=Astronomy and Astrophysics | volume=499 | issue=3 | pages=935–942 | date=2009 | arxiv=0903.3593 | bibcode=2009A&A...499..935D | doi=10.1051/0004-6361/200810837 | s2cid=15677079 }}</ref>

<ref name="Feng2022">{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=[[The Astrophysical Journal Supplement Series]] |volume=262 |issue=21 |page=21 |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F|s2cid=251864022 |doi-access=free }}</ref>

}}

[[Category:K-type giants]] [[Category:Planetary systems with one confirmed planet]] [[Category:Draco (constellation)]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|139357]] [[Category:Hipparcos objects|076311]] [[Category:Bright Star Catalogue objects|5811]]