HD 156279#Planetary system

{{Starbox observe

| constell = Draco

| epoch = J2000

| ra = {{RA|17|12|23.204816}}

| dec = {{DEC|+63|21|07.531205}}

| appmag_v = 8.167{{±|0.013}}

}}

{{Starbox character

| type = main-sequence

| class = K0 or G6

| b-v = 0.801{{±|0.014}}

| appmag_1_passband = R

| appmag_1 = 7.60

| appmag_2_passband = G

| appmag_2 = 7.8657

| appmag_3_passband = J

| appmag_3 = 6.677{{±|0.018}}

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|−20.144|0.161}}

| prop_mo_ra = {{val|−1.879|0.024}}

| prop_mo_dec = {{val|160.429|0.027}}

| pm_footnote =

| parallax = 27.6756

| p_error = 0.0200

| parallax_footnote =

| absmag_v = 5.25

}}

{{Starbox detail

| mass = 0.93{{±|0.02}}

| temperature = 5,449{{±|31}}

| luminosity = 0.70{{±|0.01}}

| radius = 0.94{{±|0.02}}

| gravity = 4.45{{±|0.03}}

| age_gyr = 7.4{{±|2.2}}

| metal_fe = 0.14{{±|0.01}}

| rotational_velocity = 2.51{{±|1}}

}}

{{Starbox catalogue

| names = {{odlist | HD=156279 | HIP=84171 | BD=+63 1335 | SAO=17390 | NLTT=44404 | PPM=20265 | TYC=4202-656-1 | 2MASS=J17122319+6321074 | Gaia DR2=1631084478574318976 }}

}}

{{Starbox reference

| Simbad = HD+156279

}}

{{Starbox end

}}

HD 156279 is a star with a pair of orbiting exoplanets located in the northern constellation of Draco. It has various alternate designations, including HIP 84171 and BD+63 1335. Parallax measurements yield a distance of 118 light years from the Sun, but it is drifting closer with a radial velocity of −20 km/s. Despite an absolute magnitude of 5.25, at that distance the star is too faint to be visible to the naked eye with an apparent visual magnitude of 8.17. It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions.

The spectrum of HD 156279 has a stellar classification of G6 or K0, depending on the study. Hence it presents as an ordinary main sequence star of the late G-type or early K-type. The star has 93% of the mass of the Sun and 94% of the Sun's radius. HD 156279 is roughly seven billion years old and is spinning with a projected rotational velocity of 2.5 km/s. Based on the abundance of iron, this star is slightly enriched in heavy elements, having 140% of the solar abundance. It is radiating 70% of the luminosity of the Sun from its photosphere at an effective temperature of 5,449 K.

Planetary system

Orbiting HD 156279 are two superjovian planets, the inner HD 156279 b (discovered in 2011) and outer HD 156279 c (discovered in 2016). In 2022, the inclination and true mass of HD 156279 c were measured via astrometry.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|9.50|0.31|0.32|p=≥ }}

| radius =

| semimajor = {{val|0.5041|0.0082|0.0085}}

| period = {{val|133.4031|0.0037|0.0040}}

| eccentricity = {{val|0.64779|0.00068|0.00066}}

| inclination =

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|9.750|1.319|0.605}}

| radius =

| semimajor = {{val|5.486|0.219|0.240}}

| period = {{val|4818.3|44.5|43.1}}

| eccentricity = {{val|0.261|0.006}}

| inclination = {{val|74.699|36.999|10.533}}

}}

References

{{Reflist|refs=

{{cite simbad

| title=HD 156279 | access-date = 13 October 2020}}

{{citation | postscript=.

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{citation | postscript=.

| title=OCCASO. IV. Radial velocities and open cluster kinematics

| display-authors=1 | last1=Carrera | first1=R.

| last2=Casamiquela | first2=L. | last3=Carbajo-Hijarrubia | first3=J.

| last4=Balaguer-Núñez | first4=L. | last5=Jordi | first5=C.

| last6=Romero-Gómez | first6=M. | last7=Blanco-Cuaresma | first7=S.

| last8=Cantat-Gaudin | first8=T. | last9=Lillo-Box | first9=J.

| last10=Masana | first10=E. | last11=Pancino | first11=E.

| journal=Astronomy & Astrophysics

| volume=658 | id=A14 | date=February 2022

| doi=10.1051/0004-6361/202141832 | arxiv=2110.02110

| bibcode=2022A&A...658A..14C }}

{{citation | postscript=.

| title=Age consistency between exoplanet hosts and field stars

| display-authors=1 | 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 }}

{{citation | postscript=.

| title=Statistics of long period gas giant planets in known planetary systems

| 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.

| display-authors=1 | journal=The Astrophysical Journal

| volume=821 | issue=2 | page=89 | year=2016

| doi=10.3847/0004-637X/821/2/89 | doi-access=free | arxiv=1601.07595

| bibcode=2016ApJ...821...89B | s2cid=19709252 }}

{{citation | postscript=.

| title=A high binary fraction for the most massive close-in giant planets and brown dwarf desert members

| display-authors=1 | last1=Biller | first1=B.

| last2=Mužić | first2=K. | last3=Lopez | first3=E.

| last4=Bonavita | first4=M. | last5=Rice | first5=K.

| last6=Fontanive | first6=C. | last7=Biller | first7=B.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=485 | issue=4 | pages=4967–4996 | year=2019

| doi=10.1093/mnras/stz671 | doi-access=free

| arxiv=1903.02332

| bibcode=2019MNRAS.485.4967F | s2cid=84180618}}

{{citation | postscript=.

| title=3D Selection of 167 Substellar Companions to Nearby Stars

| journal=The Astrophysical Journal Supplement Series

| volume=262 | issue=21 | page=21 | date=August 2022

| doi=10.3847/1538-4365/ac7e57 | arxiv=2208.12720 | doi-access=free

| bibcode=2022ApJS..262...21F | s2cid=251864022 }}

{{citation | postscript=.

| title=HD 156279 Overview | access-date=2024-01-10

| work=NASA Exoplanet Archive | publisher=California Institute of Technology

| url=https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=HD+156279&type=CONFIRMED_HOST }}

{{citation | postscript=.

| title=The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary

| display-authors=1 | last1=Díaz | first1=Rodrigo F.

| last2=Santerne | first2=Alexandre | last3=Sahlmann | first3=Johannes

| last4=Hébrard | first4=Guillaume | last5=Eggenberger | first5=Anne

| last6=Santos | first6=Nuno C. | last7=Moutou | first7=Claire

| last8=Arnold | first8=Luc | last9=Boisse | first9=Isabelle

| last10=Bonfils | first10=Xavier | last11=Bouchy | first11=François

| last12=Delfosse | first12=Xavier | last13=Desort | first13=Morgan

| last14=Ehrenreich | first14=David | last15=Forveille | first15=Thierry

| last16=Lagrange | first16=Anne-Marie | last17=Lovis | first17=Christophe

| last18=Pepe | first18=Francesco | last19=Perrier | first19=Christian

| last20=Queloz | first20=Didier | last21=Ségransan | first21=Damien

| last22=Udry | first22=Stéphane | last23=Vidal-Madjar | first23=Alfred

| journal=Astronomy & Astrophysics

| volume=A113 | page=538 | year=2012

| doi=10.1051/0004-6361/201117935 | arxiv=1111.1168

| bibcode=2012A&A...538A.113D |s2cid=55322205 }}

}}

Category:G-type main-sequence stars

Category:K-type main-sequence stars

Category:Planetary systems with two confirmed planets

Category:Draco (constellation)

Category:Durchmusterung objects

156279

084171

J17122319+6321074