HD 4308
{{short description|Star in the constellation Tucana}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| dec = {{DEC|–65|38|58.2825}}
| appmag_v = {{Val|6.544|0.005}}
| constell = Tucana
}}
{{Starbox character
| type = main sequence
| appmag_1_passband = B
| appmag_2_passband = V
| appmag_3_passband = J
| appmag_3 = {{Val|5.366|0.024}}
| appmag_4_passband = H
| appmag_4 = {{Val|5.101|0.016}}
| appmag_5_passband = K
| appmag_5 = {{Val|4.945|0.020}}
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|+95.251|0.0162}}
| prop_mo_ra = {{val|157.504|0.041}}
| prop_mo_dec = {{val|−741.599|0.040}}
| parallax = 45.3930
| p_error = 0.0220
| absmag_v =
}}
{{Starbox detail
| mass = {{Val|0.95|0.05}}
| radius = {{Val|1.04|0.03}}
| gravity = {{Val|4.38|0.02}}
| luminosity = {{Val|1.03|0.01}}
| temperature = {{Val|5714|61|fmt=commas}}
| metal_fe = {{Val|−0.35|0.07}}
| age_gyr = {{Val|1.6|4.0}} or {{Val|10.0|0.5|1.0}}
| rotational_velocity = {{Val|1.0|1.0}}
}}
{{Starbox catalog
| names = {{odlist | BD=-27°223 | GJ=31.5 | GJ2=9028 | HD=4308 | HIP=3497 | SAO=248244 | GC=897 | GCRV=50662 | LFT=71 | LHS=1139 | LPM=40 | LTT=416 | 2MASS=J00443925-6538581 | TYC=8847-598-1 | PPM=352003 }}
}}
{{Starbox reference
| Simbad = HD+4308
| ARICNS = 00063
| EPE = HD+4308
}}
{{Starbox end}}
HD 4308 is a single star with an orbiting exoplanet in the southern constellation of Tucana. It has a yellow hue and is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.54. This object is located at a distance of 72 light years, as determined from parallax measurements. It is a population II star and is considered to be a member of the thick disk. The star is receding from the Sun with a radial velocity of +95 km/s.
This is a Sun-like G-type main-sequence star with a stellar classification of G6VFe-0.9, where the suffix notation indicates an underabundance of iron in the spectrum. The age of the star is poorly constrained, with estimated ranging from 1.6 billion years up to 10 billion. It has 95% of the mass of the Sun but 104% of the Sun's radius. The star is radiating nearly the same luminosity as the Sun from its photosphere at an effective temperature of 5,714 K.
Planetary system
In 2005, a low-mass planet was found in orbit around this star using the radial velocity method with the HARPS spectrograph. It is following a circular orbit close to its host star with a period of just 15.6 days. Unusual for a star with planets, HD 4308 has a metallicity lower than that of the Sun.
{{OrbitboxPlanet begin
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = >0.0442
| period = {{Val|15.56|0.02}}
| semimajor = 0.115
| eccentricity = {{Val|0.00|0.01}}
}}
{{Orbitbox end}}
See also
References
{{reflist|refs=
{{cite simbad | title=HD 4308 | accessdate=2019-11-05 }}
| title=Ages of 70 Dwarfs of Three Populations in the Solar Neighborhood: Considering O and C Abundances in Stellar Models
| last1=Ge | first1=Z. S. | last2=Bi | first2=S. L.
| last3=Chen | first3=Y. Q. | last4=Li | first4=T. D.
| last5=Zhao | first5=J. K. | last6=Liu | first6=K.
| last7=Ferguson | first7=J. W. | last8=Wu | first8=Y. Q.
| display-authors=1 | journal=The Astrophysical Journal
| volume=833 | issue=2 | id=161 | pages=13 | date=December 2016
| doi=10.3847/1538-4357/833/2/161 | arxiv=1612.01622
| bibcode=2016ApJ...833..161G | s2cid=119190116 | doi-access=free }}
| title=Chemical abundances of 451 stars from the HARPS GTO planet search program. Thin disc, thick disc, and planets
| display-authors=1 | last1=Neves | first1=V.
| last2=Santos | first2=N. C. | last3=Sousa | first3=S. G.
| last4=Correia | first4=A. C. M. | last5=Israelian | first5=G.
| journal=Astronomy and Astrophysics
| volume=497 | issue=2 | pages=563–581 | date=April 2009
| doi=10.1051/0004-6361/200811328 | arxiv=0902.3374
| bibcode=2009A&A...497..563N | s2cid=7907201 }}
| last1=Cutri | first1=R. M. | last2=Skrutskie | first2=M. F.
| last3=van Dyk | first3=S. | last4=Beichman | first4=C. A.
| last5=Carpenter | first5=J. M. | last6=Chester | first6=T.
| last7=Cambresy | first7=L. | last8=Evans | first8=T.
| last9=Fowler | first9=J. | last10=Gizis | first10=J.
| last11=Howard | first11=E. | last12=Huchra | first12=J.
| last13=Jarrett | first13=T. | last14=Kopan | first14=E. L.
| last15=Kirkpatrick | first15=J. D. | last16=Light | first16=R. M.
| last17=Marsh | first17=K. A. | last18=McCallon | first18=H.
| last19=Schneider | first19=S. | last20=Stiening | first20=R.
| last21=Sykes | first21=M. | last22=Weinberg | first22=M.
| last23=Wheaton | first23=W. A. | last24=Wheelock | first24=S.
| last25=Zacarias | first25=N. | display-authors=1
| date=June 2003 | publisher=NASA/IPAC
| title=2MASS All Sky Catalog of point sources
| bibcode=2003tmc..book.....C }}
| last1=Koen | first1=C. | last2=Kilkenny | first2=D.
| last3=van Wyk | first3=F. | last4=Marang | first4=F.
| title=UBV(RI)CJHK observations of Hipparcos-selected nearby stars
| journal=Monthly Notices of the Royal Astronomical Society
| volume=403 | issue=4 | date=April 21, 2010 | pages=1949–1968
| doi=10.1111/j.1365-2966.2009.16182.x
| bibcode=2010MNRAS.403.1949K | doi-access=free }}
| last1=Fuhrmann | first1=K. | last2=Chini | first2=R.
| last3=Kaderhandt | first3=L. | last4=Chen | first4=Z.
| title=Multiplicity among Solar-type Stars
| display-authors=1 | journal=The Astrophysical Journal
| volume=836 | issue=1 | pages=139 | year=2017
| bibcode=2017ApJ...836..139F | doi=10.3847/1538-4357/836/1/139 | doi-access=free }}
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
| display-authors=1 | 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 }}
| display-authors=1 | last1=Soubiran | first1=C.
| last2=Jasniewicz | first2=G. | last3=Chemin | first3=L.
| last4=Crifo | first4=F. | last5=Udry | first5=S.
| last6=Hestroffer | first6=D. | last7=Katz | first7=D.
| title=The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release
| journal=Astronomy & Astrophysics
| volume=552 | id=A64 | pages=11 | date=April 2013
| bibcode=2013A&A...552A..64S | arxiv=1302.1905
| doi=10.1051/0004-6361/201220927 | s2cid=56094559 }}
| title=Revising the ages of planet-hosting stars
| url=http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html
| last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.
| last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.
| display-authors=1 | journal=Astronomy and Astrophysics
| year=2015 | volume=575 | at=A18
| arxiv=1411.4302 | bibcode=2015A&A...575A..18B
| doi=10.1051/0004-6361/201424951 | s2cid=54555839
}}
{{Cite Gaia DR2|4708607629114652032}}
| title=The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308
| url=http://www.aanda.org/articles/aa/full/2006/07/aa4084-05/aa4084-05.html
| last1=Udry | first1=S. | last2=Mayor | first2=M.
| last3=Benz | first3=W. | last4=Bertaux | first4=J.-L.
| last5=Bouchy | first5=F. | last6=Lovis | first6=C.
| last7=Mordasini | first7=C. | last8=Pepe | first8=F.
| last9=Queloz | first9=D. | display-authors=1
| journal=Astronomy and Astrophysics
| volume=447 | issue=1 | pages=361–367 | year=2006
| arxiv=astro-ph/0510354 | bibcode=2006A&A...447..361U
| doi=10.1051/0004-6361:20054084 | s2cid=119078261
}}
}}
External links
- {{cite web
| url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+4308
| title=HD 4308
| work=Exoplanets
| access-date=2009-05-23
| archive-url=https://web.archive.org/web/20160303200642/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+4308
| archive-date=2016-03-03
| url-status=dead
}}
{{Sky|00|44|39.2677|-|65|38|58.280|71.39}}
{{Stars of Tucana}}
{{DEFAULTSORT:HD 4308}}
Category:G-type main-sequence stars
Category:Planetary systems with one confirmed planet