HD 204313

{{Starbox observe

| epoch = J2000.0

| constell = Capricornus

| ra = {{RA|21|28|12.20609}}

| dec = {{DEC|-21|43|34.5182}}

| appmag_v = 7.99

}}

{{Starbox character

| type =

| class = G5V

| appmag_1_passband = B

| appmag_1 = 8.687

| appmag_2_passband = J

| appmag_2 = {{val|6.812|0.024}}

| appmag_3_passband = H

| appmag_3 = {{val|6.539|0.040}}

| appmag_4_passband = K

| appmag_4 = {{val|6.459|0.018}}

| r-i =

| v-r =

| b-v = {{val|0.697|0.022}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|-9.79|0.12}}

| prop_mo_ra = {{val|42.751}}

| prop_mo_dec = {{val|-270.443}}

| pm_footnote =

| parallax = 20.7705

| p_error = 0.0343

| parallax_footnote =

| absmag_v = 4.61

}}

{{Starbox detail

| mass = {{val|1.06|0.03}}

| radius = {{val|1.08|0.03}}

| gravity = {{val|4.39|0.04}}

| luminosity = {{val|1.18|0.03}}

| temperature = {{val|5783|48|fmt=commas}}

| metal_fe = 0.18

| age_gyr = {{val|4.3|1.8}}

| rotational_velocity = 0.846

}}

{{Starbox catalog

| names = {{odlist | CD=−22°5691 | GC=30045 | HD=204313 | HIP=106006 | LTT=8525 | PPM=272526 | SAO=190362 }}

}}

{{Starbox reference

| Simbad = HD+204313

| NSTED = HD 204313

| EPE = HD+204313

}}

HD 204313 is a star with two and possibly three exoplanetary companions in the southern constellation of Capricornus. With an apparent magnitude of 7.99, it is an eighth magnitude star that is too faint to be readily visible to the naked eye. The star is located at a distance of 157 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −10 km/s.

This is an ordinary G-type main-sequence star with a stellar classification of G5V, which indicates it is generating energy through hydrogen fusion at its core. It is an estimated four billion years old, chromospherically extremely quiet, and is spinning with a projected rotational velocity of just 0.8 km/s. The star has a slightly larger mass and radius compared to the Sun. It is radiating 118% of the luminosity of the Sun from its photosphere at an effective temperature of 5,783 K.

Planetary system

This star was in observation by the CORALIE radial velocity planet-search program since the year 2000. In August 2009, a superjovian planetary companion was announced. Two years later, a hot Neptune HD 204313 c on a 35-day orbit was announced, followed by a third Jupiter-like planet candidate HD 204313 d on a 2800-day orbit, which was announced in 2012. Assuming that planet d exists, planets b & d are apparently orbiting close to a 7:5 mean motion resonance, which may be stabilizing their periods.

A 2015 study independently confirmed the first two discoveries, but did not detect any significant signal at the claimed period of planet d. Another study in 2022 agreed with these results, in addition to finding a new planet or brown dwarf, designated HD 204313 e to differentiate it from the dubious candidate. The inclination and true mass of planets b & e were measured via astrometry.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = c

| mass_earth = {{val|17.6|1.7|p=≥}}

| period = {{val|34.905|0.012}}

| semimajor = {{val|0.2099|0.0071}}

| eccentricity = {{val|0.059|0.051|0.041}}

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|4.615|1.290|0.306}}

| period = {{val|2041.1|1.7|1.9}}

| semimajor = {{val|3.185|0.130|0.143}}

| eccentricity = {{val|0.100|0.003}}

| inclination = {{val|72.917|31.372|21.476}}

}}

{{OrbitboxPlanet

| exoplanet = e

| mass = {{val|15.317|4.890|5.183}}

| period = {{val|7325.6|399.9|369.1}}

| semimajor = {{val|7.457|0.399|0.427}}

| eccentricity = {{val|0.253|0.071|0.065}}

| inclination = {{val|176.092|0.963|2.122}}

}}

References

{{Reflist|refs=

{{cite journal

| 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 }}

{{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 }}

{{cite journal

| title=Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur

| display-authors=1 | last1=Costa Silva | first1=A. R.

| last2=Delgado Mena | first2=E. | last3=Tsantaki | first3=M.

| journal=Astronomy & Astrophysics

| volume=634 | id=A136 | pages=10 | date=February 2020

| doi=10.1051/0004-6361/201936523 | arxiv=1912.08659

| bibcode=2020A&A...634A.136C | s2cid=209405391 }}

{{cite journal

| url=http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full_html/2010/03/aa12136-09/aa12136-09.html

| title=The CORALIE survey for southern extrasolar planets. XVI. Discovery of a planetary system around HD 147018 and of two long period and massive planets orbiting HD 171238 and HD 204313

| last1=Ségransan | first1=D. | last2=Udry | first2=S.

| last3=Naef | first3=D. | last4=Pepe | first4=F.

| last5=Queloz | first5=D. | last6=Santos | first6=N. C.

| last7=Demory| first7=B. O. | last8=Figueira | first8=P.

| last9=Gillon | first9=M. | last10=Marmier | first10=M.

| last11=Mégevand | first11=D. | last12=Sosnowska | first12=D.

| last13=Tamuz | first13=O. | last14=Triaud | first14=A. H. M. J. M.

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=511 | date=2010 | page=A45

| doi=10.1051/0004-6361/200912136 | s2cid=8864844

| bibcode=2010A&A...511A..45S | arxiv=0908.1479 }}

{{cite journal

| title=The HARPS search for southern extra-solar planets. XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles

| url=https://www.aanda.org/articles/aa/full_html/2016/01/aa26729-15/aa26729-15.html

| last1=Díaz | first1=R. F. | last2=Ségransan | first2=D.

| last3=Udry | first3=S. | last4=Lovis | first4=C.

| last5=Pepe | first5=F. | last6=Dumusque | first6=X.

| last7=Marmier | first7=M. | last8=Alonso | first8=R.

| last9=Benz | first9=W. | last10=Bouchy | first10=F.

| last11=Coffinet | first11=A. | last12=Collier Cameron | first12=A.

| last13=Deleuil | first13=M. | last14=Figueira | first14=P.

| last15=Gillon | first15=M. | last16=Lo Curto | first16=G.

| last17=Mayor | first17=M. | last18=Mordasini | first18=C.

| last19=Motalebi | first19=F. | last20=Moutou | first20=C.

| last21=Pollacco | first21=D. | last22=Pompei | first22=E.

| last23=Queloz | first23=D. | last24=Santos | first24=N.

| last25=Wyttenbach | first25=A. | display-authors=1

| journal=Astronomy and Astrophysics

| volume=585 | at=A134 | year=2016

| arxiv=1510.06446 | bibcode=2016A&A...585A.134D

| doi=10.1051/0004-6361/201526729 | s2cid=118531921 }}

{{cite journal

| title=A Second Giant Planet in 3:2 Mean-motion Resonance in the HD 204313 System

| last1=Robertson | first1=Paul | last2=Horner | first2=J.

| last3=Wittenmyer | first3=Robert A. | last4=Endl | first4=Michael

| last5=Cochran | first5=William D. | last6=MacQueen | first6=Phillip J.

| last7=Brugamyer| first7=Erik J. | last8=Simon | first8=Attila E.

| last9=Barnes | first9=Stuart I. | last10=Caldwell | first10=Caroline

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

| volume=754 | issue=1 | date=2012 | page=50

| doi=10.1088/0004-637X/754/1/50 | s2cid=118630310

| bibcode=2012ApJ...754...50R | arxiv=1205.3689 }}

{{citation

| title=The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets

| last1=Mayor | first1=M. | last2=Marmier | first2=M.

| last3=Lovis | first3=C. | last4=Udry | first4=S.

| last5=Ségransan | first5=D. | last6=Pepe | first6=F.

| last7=Benz | first7=W. | last8=Bertaux | first8=J. -L.

| last9=Bouchy | first9=F. | last10=Dumusque | first10=X.

| last11=Lo Curto | first11=G. | last12=Mordasini | first12=C.

| last13=Queloz | first13=D. | last14=Santos| first14=N. C.

| display-authors=1 | work=eprint | date=September 2011

| bibcode=2011arXiv1109.2497M | arxiv=1109.2497 }}

{{citation

| last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M.

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=4 | publication-place=Ann Arbor | year=1978

| publisher=Dept. of Astronomy, University of Michigan

| bibcode=1988mcts.book.....H }}

{{citation

| title=AMD-stability in the presence of first-order mean motion resonances

| display-authors=1 | last1=Petit | first1=A. C.

| last2=Laskar | first2=J. | last3=Boué | first3=G.

| journal=Astronomy & Astrophysics

| volume=607 | id=A35 | pages=17 | date=November 2017

| doi=10.1051/0004-6361/201731196 | arxiv=1705.06756

| bibcode=2017A&A...607A..35P | s2cid=55740532 | postscript=. }}

{{citation

| title=A Second Giant Planet in 3:2 Mean-motion Resonance in the HD 204313 System

| last1=Robertson | first1=Paul | last2=Horner | first2=J.

| last3=Wittenmyer | first3=Robert A. | last4=Endl | first4=Michael

| last5=Cochran | first5=William D. | last6=MacQueen | first6=Phillip J.

| last7=Brugamyer | first7=Erik J. | last8=Simon | first8=Attila E.

| last9=Barnes | first9=Stuart I. | last10=Caldwell | first10=Caroline

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

| doi=10.1088/0004-637X/754/1/50 | arxiv=1205.3689

| bibcode=2012ApJ...754...50R | s2cid=118630310 | postscript=. }}

{{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 }}

}}

Category:G-type main-sequence stars

Category:Planetary systems with two confirmed planets

HD 204313

Planetary system

See also

References