{{Short description|Binary star system in the constellation of Coma Berenices}} {{Starbox begin | name = HD 116029 }} {{Starbox observe | epoch = J2000 | constell = [[Coma Berenices]]<ref name=xhip/> | ra = {{RA|13|20|39.5420}}<ref name=dr3/> | dec = {{DEC|+24|38|55.311}}<ref name=dr3/> | appmag_v = 7.89<ref name=Ghezzi2018/> }} {{Starbox character | type = [[red giant branch]]<ref name=dr3>{{cite Gaia DR3|1446584503287858560}}</ref><ref name=aa2025>{{cite journal |last1=Ardern-Arentsen |first1=Anke |last2=Kane |first2=Sarah G. |last3=Belokurov |first3=Vasily |last4=Matsuno |first4=Tadafumi |last5=Montelius |first5=Martin |last6=Monty |first6=Stephanie |last7=Sanders |first7=Jason L. |title=Predicting metallicities and carbon abundances from Gaia XP spectra for (Carbon-enhanced) metal-poor stars |journal=Monthly Notices of the Royal Astronomical Society |date=2025 |volume=537 |issue=2 |page=1984 |doi=10.1093/mnras/staf096 |doi-access=free |arxiv=2410.11077 |bibcode=2025MNRAS.537.1984A }}</ref> | class = K1IV+M<ref name=Ngo2017>{{citation|arxiv=1704.02326|year=2017|doi=10.3847/1538-3881/aa6cac|last1=Ngo|first1=Henry|title=No Difference in Orbital Parameters of RV-detected Giant Planets between 0.1 and 5 au in Single versus Multi-stellar Systems|journal=The Astronomical Journal|volume=153|issue=6|page=242|bibcode=2017AJ....153..242N|s2cid=119106164 |doi-access=free }}</ref> |b-v=1.009<ref name=Johnson2011/> | variable = }} {{Starbox astrometry | radial_v = {{val|−6.74|0.12}}<ref name=dr3/> | prop_mo_ra = −14.322<ref name=dr3/> | prop_mo_dec = −52.252<ref name=dr3/> | parallax = 8.0853 | p_error =0.0384 | parallax_footnote = <ref name=dr3/> | absmag_v = +2.44<ref name=xhip>{{cite XHIP|65117}}</ref> }} {{Starbox orbit | reference = <ref name=Ngo2017/> | primary = HD 116029 A | name = HD 116029 B | period = <!--Period (in years)--> | period_unitless = <!--Period (no units provided by template)--> | axis = 1.392 | axis_unitless = 171 [[astronomical unit|AU]] | eccentricity = <!--Eccentricity--> | inclination = <!--Inclination (in degrees)--> | node = <!--Longitude of node (in degrees)--> | periastron = <!--Periastron epoch--> | periarg = <!--Argument of periastron (in degrees), secondary --> | periarg_primary = <!--Argument of periastron (in degrees), primary --> | k1 = <!-- Velocity semi-amplitude (SB1, or primary in SB2), in km/s --> | k2 = <!-- Velocity semi-amplitude (secondary in SB2), in km/s --> }} {{Starbox detail | source =<ref name=Ngo2017/> |component1=HD 116029 A |component2=HD 116029 B | mass = 1.445{{±|0.094}}<ref name=Ghezzi2018>{{citation|arxiv=1804.09082|year=2018|doi=10.3847/1538-4357/aac37c|last1=Ghezzi|first1=Luan|last2=Montet|first2=Benjamin T.|last3=Johnson|first3=John Asher|title=Retired a Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass|journal=The Astrophysical Journal|volume=860|issue=2|page=109|bibcode=2018ApJ...860..109G|s2cid=118969017 |doi-access=free }}</ref> | mass2= 0.26 | radius = 4.6{{±|0.1}}<ref name=Johnson2011/> | gravity = 3.40{{±|0.06}} |gravity2=5.033{{±|0.019}} | luminosity =11.7<ref name=Bonsor2013>{{citation|arxiv=1311.2947|title=Herschel Observations of Debris Discs Orbiting Planet-hosting Subgiants|year=2013|doi=10.1093/mnras/stt2128|last1=Bonsor|first1=Amy|last2=Kennedy|first2=Grant M.|last3=Wyatt|first3=Mark C.|last4=Johnson|first4=John A.|last5=Sibthorpe|first5=Bruce|journal=Monthly Notices of the Royal Astronomical Society|volume=437|issue=4|pages=3288–3297|doi-access=free |s2cid=53586078}}</ref> | temperature =4894{{±|36}}<ref name=Ghezzi2018/> |temperture2= 3343{{±|29}} | metal = 0.12 ± 0.02<ref name=Ghezzi2018/> | rotation = | rotational_velocity = 1.0{{±|0.6}}<ref name=Ghezzi2018/> | age_gyr = 2.7{{±|0.5}}<ref name=Bonsor2013/> }} {{Starbox catalog | names = {{odlist|HD=116029|BD=+25 26232|2MASS=J13203954+2438555|HIP=65117|TYC=1994-2335-1}}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+116029 }} {{Starbox end}}
'''HD 116029''' is a binary star system about {{val|400|fmt=commas|u=light-years}} away.
The primary [[subgiant]] star ''HD 116029 A'' belongs to the [[spectral class]] K1. Its age is younger than the Sun`s at 2.7{{±|0.5}} billion years.<ref name=Bonsor2013/> The primary star is slightly enriched by heavy elements, having 130% of solar abundance.<ref name=Johnson2011/> The primary star does not have detectable flare activity.<ref>[https://iopscience.iop.org/article/10.1088/0004-637X/766/1/9 Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013]</ref>
In 2016 the co-moving binary stellar companion ''HD 116029 B'' was detected. It is a red dwarf star of visual magnitude 16.<ref>{{citation|arxiv=1601.01524|title=A lucky imaging multiplicity study of exoplanet host stars II|year=2016|doi=10.1093/mnras/stw049|last1=Ginski|first1=C.|last2=Mugrauer|first2=M.|last3=Seeliger|first3=M.|last4=Buder|first4=S.|last5=Errmann|first5=R.|last6=Avenhaus|first6=H.|last7=Mouillet|first7=D.|last8=Maire|first8=A.-L.|last9=Raetz|first9=S.|journal=Monthly Notices of the Royal Astronomical Society|volume=457|issue=2|pages=2173–2191|doi-access=free |bibcode=2016MNRAS.457.2173G|s2cid=53626523}}</ref> The companion was confirmed orbiting the primary at a projected separation of 171 [[astronomical unit|AU]] in 2017.<ref name=Ngo2017/>
==Planetary system== In 2011 one [[super-jupiter|superjovian]] planet, [[HD 116029 b]], on a mildly eccentric orbit around star ''HD 116029 A'' was discovered utilizing the [[radial velocity method]].<ref name=Johnson2011>{{citation|arxiv=1108.4205|year=2011|doi=10.1088/0067-0049/197/2/26|author1=John Asher Johnson|last2=Clanton|first2=Christian|last3=Howard|first3=Andrew W.|last4=Bowler|first4=Brendan P.|last5=Henry|first5=Gregory W.|last6=Marcy|first6=Geoffrey W.|last7=Crepp|first7=Justin R.|last8=Endl|first8=Michael|last9=Cochran|first9=William D.|last10=MacQueen|first10=Phillip J.|last11=Wright|first11=Jason T.|last12=Isaacson|first12=Howard|title=Retired a Stars and Their Companions. Vii. 18 New Jovian Planets|journal=The Astrophysical Journal Supplement Series|volume=197|issue=2|page=26|bibcode=2011ApJS..197...26J|s2cid=15088371}}</ref> One more planet on a wider orbit was detected in 2016. The planets ''b'' and ''c'' are orbiting in a 2:3 [[orbital resonance]].<ref>{{citation|arxiv=1601.07595|year=2016|doi=10.3847/0004-637X/821/2/89|last1=Bryan|first1=Marta L.|last2=Knutson|first2=Heather A.|last3=Howard|first3=Andrew W.|last4=Ngo|first4=Henry|last5=Batygin|first5=Konstantin|last6=Crepp|first6=Justin R.|last7=Fulton|first7=B. J.|last8=Hinkley|first8=Sasha|last9=Isaacson|first9=Howard|last10=Johnson|first10=John A.|last11=Marcy|first11=Geoffry W.|last12=Wright|first12=Jason T.|title=Statistics of Long Period Gas Giant Planets in Known Planetary Systems|journal=The Astrophysical Journal|volume=821|issue=2|page=89|bibcode=2016ApJ...821...89B|s2cid=19709252 |doi-access=free }}</ref>
{{OrbitboxPlanet begin | table_ref = <ref name=Johnson2011/><ref name=exoplanetC>[https://exoplanet.eu/catalog/hd_116029_a_c--6885/ Planet HD 116029 A c on exoplanet.eu]</ref> }} {{OrbitboxPlanet | exoplanet = [[HD 116029 A b]] | mass = ≥2.1{{±|0.2}} | radius = | semimajor = 1.73{{±|0.04}} | period = 670.2{{±|8.3}} | eccentricity = <0.21 | inclination = }} {{OrbitboxPlanet | exoplanet = [[HD 116029 A c]] | mass = ≥1.27{{±|0.1}} | radius = | semimajor = | period = 907{{±|30}} | eccentricity = 0.038{{±|0.127|0.038}} | inclination = }} {{Orbitbox end}}
==References== <references>
<ref name=SIMBAD>{{cite simbad|title=HD 116029|access-date = 19 October 2020}}</ref>
</references>
{{Coma Berenices}} {{Sky|13|20|39.5422|+|24|38|55.3099}}
[[Category:Coma Berenices]] [[Category:Planetary systems with two confirmed planets]] [[Category:Multi-star planetary systems]] [[Category:Hipparcos objects|065117]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|116029]] [[Category:K-type subgiants]] [[Category:M-type main-sequence stars]]