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| {{Starbox begin
| | Royal Votaw is my name but I by no extended car [http://Www.ncdoj.gov/Consumer/Automobiles/Extended-Car-Warranties.aspx warranty] means really favored that extended auto warranty name. Delaware is the location I adore most but I need to move for my family members. Interviewing is car warranty what she does in her day occupation but quickly her spouse and her will begin their personal company. The extended auto warranty thing I adore most [http://Www.Fcc.gov/guides/auto-warranty-scams flower arranging] and now I have time to take on new things.<br><br>[http://www.smartusa.com/warranty/ Feel free] to visit my homepage [http://dore.gia.ncnu.edu.tw/88ipart/node/2219259 http://dore.gia.ncnu.edu.tw/88ipart/node/2219259] |
| | name = Gliese 570
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| }}
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| {{Starbox image
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| | image = [[File:Gl570satlas.jpg|250px|alt=Gl570]]
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| | caption = The [[ternary star system]] Gliese 570. The T-type methane [[brown dwarf]] Gliese 570D is indicated with an arrow.
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| | credit = [[2MASS]]
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| }}
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| {{Starbox observe
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| | epoch = [[J2000.0]]
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| | constell = [[Libra (constellation)|Libra]]
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| | ra = {{RA|14|57|28.00144}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|-21|24|55.7131}}<ref name=aaa474_2_653/>
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| | appmag_v = 5.64 / ? / 9.90
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| }}
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| {{Starbox character
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| | class = K4V / M1V / M3V / T7V
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| | b-v = 1.11 / 1.51
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| | u-b = 1.06 /1.22
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| | variable = ''None''
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| }}
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| {{Starbox astrometry
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| | radial_v = +27.9
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| | prop_mo_ra = 1037.06<ref name=aaa474_2_653/>
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| | prop_mo_dec = -1725.87<ref name=aaa474_2_653/>
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| | parallax = 171.22
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| | p_error = 0.94
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| | parallax_footnote=<ref name=aaa474_2_653/>
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| | absmag_v = 6.79 / ? / 11.05
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| }}
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| {{Starbox detail|
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| | mass = {{nowrap|0.802 ± 0.040}}<ref name="aaa505">{{cite journal
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| | author=Demory, B.-O. | coauthors=''et al.''
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| | title=Mass-radius relation of low and very low-mass stars revisited with the VLTI
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| | journal=Astronomy and Astrophysics | volume=505 | issue=1
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| |date=October 2009 | pages=205–215
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| | doi=10.1051/0004-6361/200911976
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| | bibcode=2009A&A...505..205D |arxiv = 0906.0602 }}</ref> / 0.55 / 0.35 / 0.05
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| | radius = {{nowrap|0.739 ± 0.019}}<ref name="aaa505" /> / 0.65
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| | rotation = 48.3 [[day]]s
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| | luminosity_visual = 0.16 / 0.02 / 0.003 / ?
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| | luminosity_bolometric = 0.22<ref group=note name=bollumincalc/>
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| / 0.04 / ? / 3•10<sup>-6</sup><ref name=ammoniapaper/> | |
| | temperature = {{nowrap|4597 ± 101}}<ref name="aaa505" /> / 2700
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| | rotational_velocity = 1.50<ref name="aaa505" />
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| | metal = <math>\begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ 0.06\end{smallmatrix}</math><ref name="aaa505" />
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| | age =
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| }}
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| {{Starbox catalog
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| | names = 33 G. Librae, [[Gliese Catalogue of Nearby Stars|GJ 570]], [[Bright Star Catalogue|HR]] 5568, [[Henry Draper catalogue|HD]] 131977 / 131976/ ?, [[Bonner Durchmusterung|BD]] -20°4125, [[Luyten Half-Second catalogue|LHS]] 387, [[Luyten Two-Tenths catalogue|LTT]] 5949, [[General Catalogue of Trigonometric Parallaxes|GCTP]] 3375.00, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 183040, FK5 1391, LFT 1161, LPM 551, Vys 726, ADS 9446, [[Hipparcos catalogue|HIP]] 73184 / 73182 / ?
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| }}
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| {{Starbox reference
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| | Simbad = GJ+570
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| | NSTED = GJ+570A
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| | ARICNS = 01180
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| | EPE = <!--Name-->
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| }}
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| {{Starbox end}}
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| '''Gliese 570''', also known as '''33 G. Librae''', is a [[multiple star|ternary star system]] approximately 19 [[light-year]]s away. The primary star is an [[orange dwarf]] [[star]] (much dimmer and smaller than the [[Sun]]). The other secondary stars are themselves a [[binary star|binary system]], two [[red dwarf]]s that orbit one another. A [[brown dwarf]] has been confirmed to be orbiting in the system. In 1998, an [[extrasolar planet]] was thought to orbit the primary star, but it was discounted in 2000.
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| == Distance and visibility ==
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| In the night sky, the Gliese 570 system lies in the southwestern part of [[Libra (constellation)|Libra]]. The system is southwest of [[Alpha Librae]] and northwest of [[Sigma Librae]]. In the early 1990s, the European [[Hipparcos]] mission measured the [[parallax]] of components B and C, suggesting that the system was at a distance of 24.4 [[light-year]]s from the [[Sun]]. This, however, was a relatively large error as Earth-based parallax and orbit observations suggest that the two stars are actually part of a system with Gliese 570 A, and must actually lie at the same distance.
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| == Star system ==
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| The primary star of the system (component A) is an [[orange dwarf]] star that may just have over three fourths the [[mass]] of the [[Sun]], about 77 percent of its [[radius]], and only 15.6 percent of its visual [[luminosity]]. It has a separation of 190 [[astronomical unit]]s from the binary components B and C, moving in an [[Orbital eccentricity|eccentric]] orbit that takes at least 2130 years to complete.<ref>{{cite web |url=http://ad.usno.navy.mil/wds/orb6.html |title=Sixth Catalog of Orbits of Visual Binary Stars |accessdate=2008-05-18}}</ref> Gliese 570 A is [[spectral type]] K4V and emits X-rays.<ref name=Schmitt>{{ cite journal |author=Schmitt JHMM, Fleming TA, Giampapa MS |title=The X-Ray View of the Low-Mass Stars in the Solar Neighborhood |journal=Ap J. |month=September |volume=450 |issue=9 |pages=392–400 |bibcode=1995ApJ...450..392S |doi=10.1086/176149 |year=1995 }}</ref> | |
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| A binary system in their own right, components B and C are both rather dim [[red dwarf]] stars that have less mass, radius, and luminosity than the [[Sun]]. Component B is [[spectral type]] M1V, component C is [[spectral type]] M3V, and both emit X-rays.<ref name=Schmitt/>
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| [[Image:GJ570D.jpg|thumb|left|An artist's impression of Gliese 570 D showing the primary stars]]
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| On January 15, 2000, astronomers announced that they had found one of the coolest [[brown dwarfs]] then known. Catalogued as Gliese 570 D (or rarely Gliese 570 d), it was observed at a wide separation of more than 1,500 astronomical unit from the triple star system.<ref>{{cite journal | bibcode=2000ApJ...531L..57B |author=Burgasser et al.|title=Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B |journal = [[The Astrophysical Journal]] | volume=531 | issue=1 | pages=L57–L60 | year=2000|doi=10.1086/312522 | last2=Kirkpatrick | first2=J. Davy | last3=Cutri | first3=Roc M. | last4=McCallon | first4=Howard | last5=Kopan | first5=Gene | last6=Gizis | first6=John E. | last7=Liebert | first7=James | last8=Reid | first8=I. Neill | last9=Brown | first9=Michael E.|arxiv = astro-ph/0001194 }}</ref> It has an estimated mass of 50 times that of [[Jupiter]].
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| The status of Gliese 570 D as a [[brown dwarf]] was confirmed by [[Doppler spectroscopy]] at the [[Cerro Tololo Interamerican Observatory]] in [[Chile]]. The surface temperature of this substellar object was found to be a relatively cool 500 degrees Celsius, making it cooler and less luminous than any other known brown dwarf (including the prototype [[Stellar classification#Class T: methane dwarfs|"T" dwarf]]), and classifying the object as a T7-8V brown dwarf. No X-rays have been reported from this [[brown dwarf]].
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| ==Claims of a planetary system==
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| In 1998, an [[extrasolar planet]] was announced to orbit the primary star within the Gliese 570 system. The planet, identified as "Gliese 570 Ab", was considered doubtful and the claim was retracted in 2000.<ref>{{cite journal | url= http://aa.springer.de/papers/0362002/2300585/small.htm|author=Kurster et al.|title=The planet search program at the ESO Coud´e Echelle spectrometer I. Data modeling technique and radial velocity precision tests |journal = [[Astronomy and Astrophysics]] | volume=362 | year=2000 | pages=585–594 |bibcode = 2000A&A...362..585E }}</ref> No extrasolar planets have been confirmed to exist in this multiple star system thus far.
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| <!--
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| {{PlanetboxOrbit begin}}
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| {{PlanetboxOrbit hypothetical
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| | exoplanet = A
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| | mass = 0.75
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| | period = 400
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| | semimajor = 1
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| | eccentricity = 0
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| }}
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| {{PlanetboxOrbit end}}
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| -->
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| == See also ==
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| * [[Epsilon Indi]]
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| * [[Gliese 229]]
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| * [[HD 188753]]
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| * [[Iota Horologii]]
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| * [[Phi2 Pavonis|Phi<sup>2</sup> Pavonis]]
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| == Notes ==
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| {{reflist|group=note|30em|refs=
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| <ref group=note name=bollumincalc>From ''L''=4π''R''<sup>2</sup>σ''T''<sub>eff</sub><sup>4</sup>, where ''L'' is the luminosity, ''R'' is the radius, ''T''<sub>eff</sub> is the effective surface temperature and ''σ'' is the [[Stefan–Boltzmann constant]].</ref>
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| }}
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| ==References==
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| {{reflist|30em|refs=
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| <ref name=aaa474_2_653>{{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 |date=November 2007 | pages=653–664 | doi=10.1051/0004-6361:20078357 | bibcode=2007A&A...474..653V | arxiv=0708.1752 }}</ref>
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| <ref name=ammoniapaper>{{citation | last1=Saumon | first1=D. | last2=Marley | first2=M. | last3=Cushing | first3=M. | last4=Leggett | first4=S. | last5=Roellig | first5=T. | last6=Lodders | first6=K. | last7=Freeman | first7=R. | title=Ammonia as a Tracer of Chemical Equilibrium in the T7.5 Dwarf Gliese 570D | journal=The Astrophysical Journal | volume=647 | issue=1 |date=August 2006 | pages=552–557 | doi=10.1086/505419 | bibcode=2006ApJ...647..552S |arxiv= astro-ph/0605563}}</ref>
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| }}
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| == External links ==
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| * {{cite web |url=http://www.solstation.com/stars/gl570abc.htm |title=Gliese 570 / HR 5568 ABC |accessdate=2008-06-12 |work=SolStation}}
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| * {{cite web |url=http://www.extrasolar.net/planettour.asp?StarCatId=&PlanetId=42 |title=HR 5568 b |accessdate=2008-06-12 |work=Extrasolar Visions}}
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| * {{cite web |url=http://www.space.com/scienceastronomy/astronomy/brown_dwarf_000117.html |title=Astronomers Unveil Hot Photo of Cool Star |accessdate=2008-06-12 |last=Bridges |first=Andrew |date=2000-01-17 |work=SPACE.com}}
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| <!-- footers -->
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| {{Nearest systems|4}}
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| {{Stars of Libra}}
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| <!-- location -->
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| [[Category:Libra (constellation)]]
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| <!-- types -->
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| [[Category:K-type main-sequence stars]]
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| [[Category:M-type main-sequence stars]]
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| [[Category:T-type stars]]
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| [[Category:Triple star systems]]
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| <!-- catalogues -->
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| [[Category:Gould objects|Librae, 33]]
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| [[Category:Gliese and GJ objects|0570]]
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| [[Category:Henry Draper Catalogue objects|131976]]
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| [[Category:HR objects|5568]]
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| [[Category:Objects within 100 ly of Earth]]
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Royal Votaw is my name but I by no extended car warranty means really favored that extended auto warranty name. Delaware is the location I adore most but I need to move for my family members. Interviewing is car warranty what she does in her day occupation but quickly her spouse and her will begin their personal company. The extended auto warranty thing I adore most flower arranging and now I have time to take on new things.
Feel free to visit my homepage http://dore.gia.ncnu.edu.tw/88ipart/node/2219259