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| {{Starbox begin
| | Мy name is Penney (22 yearѕ old) and my hobbies are Wоοdworking and Vintage car.<br><br>Also visit my blog post ... [http://Livejasmincreditsaddertool.Blogspot.com/ Livejasmin Credits Hack] |
| | name = Gliese 86
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| }}
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| {{Starbox observe 2s
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| | epoch = J2000.0
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| | constell = [[Eridanus (constellation)|Eridanus]]
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| | component1 = Gliese 86 A
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| | ra1 = {{RA|02|10|25.93}}<ref name="van Leeuwen2007"/>
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| | dec1 = {{DEC|-50|49|25.4}}<ref name="van Leeuwen2007"/>
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| | appmag_v1 = 6.17<ref name=spectral_library_gj86A/>
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| | component2 = Gliese 86 B
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| | ra2 = {{RA|02|10|26}}
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| | dec2 = {{DEC|-50|49|25}}
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| | appmag_v2 = <!--Apparent magnitude of the second component (Johnson-Cousins V system)-->
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| }}
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| {{Starbox character
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| | class = K1V / D?
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| | r-i = 0.40
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| | v-r = 0.45
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| | b-v = 0.812<ref name="van Leeuwen2007"/>
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| | u-b = 0.45
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| | variable = <!--Variability type-->
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| }}
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| {{Starbox astrometry
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| | radial_v = <!--Radial velocity (in km/sec)-->
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| | prop_mo_ra = 2092.86 ± 0.27<ref name="van Leeuwen2007"/>
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| | prop_mo_dec = 653.21 ± 0.30<ref name="van Leeuwen2007"/>
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| | parallax = 92.74
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| | p_error = 0.32
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| | parallax_footnote = <ref name="van Leeuwen2007"/>
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| | absmag_v = <!--Absolute magnitude (Johnson-Cousins V system)-->
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| }}
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| {{Starbox detail
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| | source = <!--[source url]-->
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| | mass = 0.79
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| | radius = 0.855 ± 0.005
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| | gravity = <!--Surface gravity (given as the base 10 logarithm expressed in cgs units)-->
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| | luminosity = <!--Luminosity (in solar luminosities); better to use luminosity_bolometric or luminosity_visual-->
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| | luminosity_bolometric = 0.47<ref name=bolometric_luminosity group=note/><!--Luminosity (in solar luminosities), bolometric-->
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| | luminosity_visual = <!--Luminosity (in solar luminosities), visual (V)-->
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| | temperature = 5188
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| | metal = [Fe/H] = -0.24
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| | rotation = 31 [[day]]s
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| | age = {{nowrap|2.4 × 10<sup>9</sup>}}<ref name="apj687">{{cite journal
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| | author=Mamajek, Eric E.; Hillenbrand, Lynne A.
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| | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
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| | journal=The Astrophysical Journal | volume=687 | issue=2
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| | pages=1264–1293 |date=November 2008
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| | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 }}</ref>
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| }}
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| {{Starbox catalog
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| | names = 13 G. Eridani, [[Gliese Catalogue of Nearby Stars|GJ]] 86, [[Henry Draper Catalogue|HD]] 13445, [[Hipparcos Catalogue|HIP]] 10138, [[Bright Star Catalogue|HR]] 637, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 232658
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| }}
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| {{Starbox reference
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| | Simbad = HD+13445
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| | ARICNS = 00185
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| | NSTED = HD+13445
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| | EPE = Gl+86
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| }}
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| {{Starbox end}}
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| '''Gliese 86''' (13 G. Eridani) is a [[K-type main-sequence star]] approximately 35 [[light-year]]s away in the [[constellation]] of [[Eridanus (constellation)|Eridanus]]. It has been confirmed that a [[white dwarf]] orbits the primary star. In 1998 the [[European Southern Observatory]] announced that an [[extrasolar planet]] was orbiting the star.<ref name="eso9855"/>
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| == Stellar components ==
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| The primary companion (Gliese 86 A) is a K-type main-sequence [[star]] of [[spectral type]] K1V. The characteristics in comparison to our [[Sun]] are 79% the mass, 86% the radius, and 50% the luminosity. The star has a close-orbiting massive [[Jovian planet]].
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| Gliese 86 B is a [[white dwarf]] located around 21 AU from the primary star, making the Gliese 86 system one of the tightest binaries known to host an extrasolar planet.<ref>{{cite journal | url=http://www.iop.org/EJ/article/0004-637X/646/1/523/64035.html | title=Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems | author=Raghavan ''et al.'' | journal=The [[Astrophysical Journal]] | volume=646 | issue=1 | pages=523–542 | year=2006 | doi=10.1086/504823 | last2=Henry | first2=Todd J. | last3=Mason | first3=Brian D. | last4=Subasavage | first4=John P. | last5=Jao | first5=Wei‐Chun | last6=Beaulieu | first6=Thom D. | last7=Hambly | first7=Nigel C. | bibcode=2006ApJ...646..523R|arxiv = astro-ph/0603836 }}</ref> It was discovered in 2001 and initially suspected to be a [[brown dwarf]],<ref>{{cite journal | url=http://www.aanda.org/articles/aa/full/2001/16/aadb012/aadb012.html | title=A second substellar companion in the Gliese 86 system. A brown dwarf in an extrasolar planetary system|author=Els, S. G. ''et al.'' | journal=[[Astronomy and Astrophysics]] | volume=370 | issue=1 | pages=L1–L4 | year=2001 | doi=10.1051/0004-6361:20010298 | bibcode=2001A&A...370L...1E}}</ref> but high contrast observations in 2005 suggested that the object is probably a white dwarf, as its spectrum does not exhibit molecular absorption features which are typical of brown dwarfs.<ref>{{cite journal |bibcode=2005MNRAS.361L..15M |title=Gl86B: a white dwarf orbits an exoplanet host star|author=Mugrauer, M. and Neuhäuser, R.|journal=[[Monthly Notices of the Royal Astronomical Society|Monthly Notices of the Royal Astronomical Society: Letters]]|volume=361|issue=1|pages=L15–L19|year=2005|doi=10.1111/j.1745-3933.2005.00055.x|arxiv = astro-ph/0506311 }}</ref> Assuming the white dwarf has a mass about half that of our Sun and that the linear trend observed in radial velocity measurements is due to Gliese 86 B, a plausible orbit for this star around Gliese 86 A has a [[semimajor axis]] of 18.42 AU and an [[eccentricity (orbit)|eccentricity]] of 0.3974.<ref>{{cite journal |bibcode=2006A&A...459..955L |title=New constrains on Gliese 86 B. VLT near infrared coronographic imaging survey of planetary hosts|author=Lagrange, A.-M. et al.|journal=[[Astronomy and Astrophysics]]|volume=459|issue=3|pages=955–963|year=2006|doi=10.1051/0004-6361:20054710}}</ref>
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| == Planetary system ==
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| The preliminary [[astrometry|astrometric]] measurements made with the [[Hipparcos]] space probe suggest the planet has an orbital [[inclination]] of 164.0° and a mass 15 times Jupiter, which would make the object a [[brown dwarf]].<ref>{{cite journal | url=http://www.iop.org/EJ/article/1538-4357/548/1/L57/005774.html | author=Han ''et al.'' | title=Preliminary astrometric masses for proposed extrasolar planetary companions | journal=The [[Astrophysical Journal]] Letters | volume=548 | issue=1 | pages=L57–L60 | year=2001 | doi=10.1086/318927 | last2=Black | first2=David C. | last3=Gatewood | first3=George | bibcode=2001ApJ...548L..57H}}</ref> However, further analysis suggests the Hipparcos measurements are not precise enough to reliably determine astrometric orbits of substellar companions, thus the orbital inclination and [[true mass]] of the candidate planet remain unknown.<ref>{{cite journal | url=http://www.aanda.org/articles/aa/full/2001/24/aa1274/aa1274.html | title=Screening the Hipparcos-based astrometric orbits of sub-stellar objects | author=Pourbaix, D. and Arenou, F. | journal=[[Astronomy and Astrophysics]] | volume=372 | issue=3 | pages=935–944 | year=2001 | doi=10.1051/0004-6361:20010597 | bibcode=2001A&A...372..935P|arxiv = astro-ph/0104412 }}</ref> It was discovered by the Swiss 1.2 m [[Leonhard Euler Telescope]] operated by the [[Geneva Observatory]].<ref>http://obswww.unige.ch/~udry/planet/coralie.html</ref>
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| The radial velocity measurements of Gliese 86 show a linear trend once the motion due to this planet are taken out. This may be associated with the orbital motion of the white dwarf companion.
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| {{OrbitboxPlanet begin
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| | table_ref = <ref name="Butler2006"/>
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| }}
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| {{OrbitboxPlanet
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| | exoplanet = [[Gliese 86 b|b]]
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| | mass = >3.91 ± 0.32
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| | semimajor = 0.1130 ± 0.0065
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| | period = 15.76491 ± 0.00039
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| | eccentricity = 0.0416 ± 0.0072
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| }}
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| {{Orbitbox end}}
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| == See also ==
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| *[[Betty_and_Barney_Hill_abduction#Analyzing_the_star_map|Map analysis of the 1961 Zeta Reticuli Incident]]
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| * [[List of extrasolar planets]]
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| == Notes ==
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| {{reflist|group=note|refs=
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| {{#tag:ref|From <math>\begin{smallmatrix}L=4 \pi R^2 \sigma T_{\rm eff}^4 \end{smallmatrix}</math>, where <math>\begin{smallmatrix}L \end{smallmatrix}</math> is the luminosity, <math>\begin{smallmatrix}R \end{smallmatrix}</math> is the radius, <math>\begin{smallmatrix}T_{\rm eff}\end{smallmatrix}</math> is the effective surface temperature and <math>\begin{smallmatrix}\sigma \end{smallmatrix}</math> is the [[Stefan–Boltzmann constant]]|group="note"|name=bolometric_luminosity}}
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| }}
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| == References ==
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| {{reflist|refs=
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| <ref name="Butler2006">{{cite journal | title=Catalog of Nearby Exoplanets | url=http://iopscience.iop.org/0004-637X/646/1/505/fulltext/ | last1=Butler | first1=R. P. | last2=Wright | first2=J. T. | last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A. | last5=Vogt | first5=S. S. | last6=Tinney | first6=C. G. | last7=Jones | first7=H. R. A. | last8=Carter | first8=B. D. | last9=Johnson | first9=J. A. | display-authors=1 | journal=The Astrophysical Journal | volume=646 | issue=1 | pages=505–522 | year=2006 | arxiv=astro-ph/0607493 | bibcode=2006ApJ...646..505B | doi=10.1086/504701 }}</ref>
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| <ref name="eso9855">{{cite press release | title=Extrasolar Planet in Double Star System Discovered from La Silla | date=November 24, 1998 | publisher=European Southern Observatory | location=Garching, Germany | url=http://www.eso.org/public/news/eso9855/ | accessdate=December 29, 2012 }}</ref>
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| <ref name=spectral_library_gj86A>{{cite journal | url=http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full/2004/05/aa3890/aa3890.html | title=Library of flux-calibrated echelle spectra of southern late-type dwarfs with different activity levels | author=C. Cincunegui and P. J. D. Mauas | journal=[[Astronomy and Astrophysics]] | volume=414 | issue=2 | pages=699–706 | year=2004 | doi=10.1051/0004-6361:20031671 | bibcode=2004A&A...414..699C}}</ref>
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| <ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=10115 Vizier catalog entry ]</ref>
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| == External links ==
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| * {{cite web |url=http://www.extrasolar.net/startour.asp?StarCatId=&StarId=17 |title=Gliese 86 |accessdate=2008-08-02 |work=Extrasolar Visions |publisher= |date= }}
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| * {{cite web |url=http://www.solstation.com/stars2/gl86.htm |title=Gliese 86 / HR 637 AB |accessdate=2008-08-02 |work=SolStation |publisher= |date= }}
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| {{Sky|02|10|14|-|50|50|00|35.9}}
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| {{Nearest bright star systems|4.}}
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| {{Stars of Eridanus}}
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| [[Category:Gliese 86]]
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| [[Category:K-type main-sequence stars]]
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| [[Category:White dwarfs]]
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| [[Category:Solar-type stars|Gliese, 0086]]
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| [[Category:Planetary systems]]
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Мy name is Penney (22 yearѕ old) and my hobbies are Wоοdworking and Vintage car.
Also visit my blog post ... Livejasmin Credits Hack