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| {{Starbox begin
| | The title of the writer car warranty is Garland. My occupation is a production and distribution officer and [https://www.Geico.com/getaquote/auto/mechanical-breakdown-insurance/ I'm performing] fairly great financially. The factor she adores most extended car warranty is [http://Www.Consumerautomotiveresearch.com/typesofwarranties.htm flower arranging] and she is trying to make it a occupation. Her husband and her selected to reside in Delaware but she requirements to transfer simply because of her [http://www.smartusa.com/warranty/ extended] auto warranty extended auto warranty family.<br><br>Also visit my blog post :: [http://Gaworldofbeverage.com/index.php?document_srl=749717&mid=testimonial extended car warranty] |
| | name=Luyten 726-8 A/B
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| }}
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| {{Starbox observe 2s
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| | epoch = J2000.0
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| | constell = [[Cetus]]
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| <!-- First component -->
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| | component1 = Luyten 726-8A (BL Ceti)
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| | ra1 = {{RA|01|39|01.54}}<ref name=SIMBADA />
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| | dec1 = {{DEC|–17|57|01.8}}<ref name=SIMBADA />
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| | appmag_v1 = 12.57<ref name=SIMBADA />
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| <!-- Second component -->
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| | component2 = Luyten 726-8B (UV Ceti)
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| | ra2 = {{RA|01|39|01.54}}<ref name=SIMBADB />
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| | dec2 = {{DEC|–17|57|01.8}}<ref name=SIMBADB />
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| | appmag_v2 = 11.99<ref name=SIMBADB />
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| }}
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| {{Starbox character
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| | class = M5.5 V + M6 V
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| | b-v = 1.87/?
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| | u-b = 1.10/?
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| | variable = [[UV Ceti variable|UV Cet]]<ref name=BL/>/[[UV Ceti variable|UV Cet]]<ref name=UV/>
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| }}
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| {{Starbox astrometry
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| | radial_v = +29.0
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| | prop_mo_ra =3321
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| | prop_mo_dec =562
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| | parallax = 373.70
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| | p_error = 2.70
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| | parallax_footnote =
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| | absmag_v =
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| }}
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| {{Starbox orbit
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| | reference = <ref name=aj95_1841/>
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| | name = Luyten 726-8 B
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| | period = 26.52
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| | axis = 1.95
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| | eccentricity = 0.62
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| | inclination = 127.3
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| | node = 150.5
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| | periarg = 285.3
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| | periastron = 1971.91
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| }}<!--
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| -->{{Starbox detail
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| <!-- First component -->
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| | component1 = Luyten 726-8 A
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| | mass = {{nowrap|0.102 ± 0.010}}<ref name=aaa364_217/>
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| | radius = 0.14
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| | luminosity = 0.00006
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| | temperature = 2,670
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| | metal =
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| | rotation =
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| | age =
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| <!-- Second component -->
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| | component2 = Luyten 726-8 B
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| | mass2 = {{nowrap|0.100 ± 0.010}}<ref name=aaa364_217/>
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| | radius2 = 0.14
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| | luminosity2 = 0.00004
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| }}
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| {{Starbox catalog
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| | names = BL Ceti/UV Ceti, [[General Catalogue of Trigonometric Parallaxes|GCTP]] 343.10 A/B, [[Luyten Half-Second catalogue|LHS]] 9/10, [[Gliese Catalogue of Nearby Stars|GJ]] 65 A/B
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| }}
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| {{Starbox reference
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| | Simbad = GJ+65<!--Search String-->
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| | NSTED = <!--Name-->
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| | ARICNS = <!--Code-->
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| | EPE = <!--Name-->
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| }}
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| {{Starbox end}}
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| '''Luyten 726-8''' (also known as '''Gliese 65''') is a [[binary star|binary]] [[star system]] that is one of Earth's nearest neighbors, at about 8.7 light years from [[Earth]] in the [[constellation]] [[Cetus]]. Luyten 726-8B is also known under the variable star designation '''UV Ceti''', being the archetype for the class of [[flare star]]s.
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| ==Star system==
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| The star system was discovered in 1948 by [[Willem Jacob Luyten]] in the course of compiling a catalog of stars of high [[proper motion]]; he noted its exceptionally high proper motion of 3.37 arc seconds annually and cataloged it as Luyten 726-8.<ref>{{ cite journal | title=New stars with proper motions exceeding 0.5" annually. | author=Luyten, W. J. | journal= [[The Astronomical Journal]] | volume=55 | pages=15 | date=December 1949 | doi=10.1086/106322 | bibcode=1949AJ.....55...15L}}</ref> | |
| The two stars are of nearly equal brightness, with visual magnitudes of 12.57 and 11.99 as seen from Earth. They orbit one another every 26.5 years. The distance between the two stars varies from {{convert|2.1|to|8.8|AU|Gm|lk=on}}. The Luyten 726-8 system is approximately {{convert|2.63|pc|ly|2|lk=on}} from [[Earth]]'s [[Solar System]], in the [[constellation]] [[Cetus]], and is thus the seventh-closest star system to Earth. Its own nearest neighbor is [[Tau Ceti]], {{convert|0.88|pc|ly|2|abbr=on}} away from it. If <math>R_v=+29</math> km/s then approximately 28,700 years ago Luyten 726-8 was at its minimal distance of 2.21 [[parsec|pc]] (7.2 ly) from the Sun.<ref name="SIMBAD2">{{cite web
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| | url=http://cdsannotations.u-strasbg.fr/annotations/simbadObject/1297613
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| | title=Annotations on V* UV Cet object
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| | publisher=Centre de Données astronomiques de Strasbourg
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| | accessdate=2010-04-14 }}</ref>
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| Luyten-726-8A was found to be a [[variable star]] and given the variable star designation '''BL Ceti'''.<ref name=BL>{{cite web | url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=BL+Cet | title=Query= BL Cet | publisher=[[Centre de Données astronomiques de Strasbourg]] | work=[[General Catalogue of Variable Stars]] | accessdate=2009-12-16}}</ref> It is a [[red dwarf]] of [[spectral type]] M5.5e. It is also a flare star, and classified as a [[UV Ceti variable]] type, but it is not nearly as remarkable or extreme in its behavior as its companion star UV Ceti. BL Ceti is also known as [[Henry Lee Giclas|G]] 272-061.<ref name=SIMBADA>{{ cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%401297616&Name=V*%20BL%20Cet | title=V* BL Cet -- Flare Star | work=[[SIMBAD]] | publisher=[[Centre de Données astronomiques de Strasbourg]] | accessdate=2009-12-16}}</ref>
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| [[File:Toronto Andrew Posa 01.jpg|thumb|left|''UV Ceti'' by Andrew Posa (1982)]]
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| Soon after{{When|date=January 2012}} the discovery of Luyten 726-8A, the slightly brighter{{citation needed|date=March 2013}} companion star Luyten 726-8B was discovered. Like Luyten 726-8A, this star was also found to be variable and given the variable star designation '''UV Ceti'''.<ref name=UV>{{cite web | url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=UV+Cet | title=Query= UV Cet | publisher=[[Centre de Données astronomiques de Strasbourg]] | work=[[General Catalogue of Variable Stars]] | accessdate=2009-12-16}}</ref> Although UV Ceti was not the first flare star discovered, it is the most prominent example of such a star, so similar flare stars are now classified as UV Ceti type variable stars. This star goes through fairly extreme changes of brightness: for instance, in 1952, its brightness increased by 75 times in only 20 seconds. UV Ceti is a [[red dwarf]] of [[spectral type]] M6.0e.<ref name=SIMBADB>{{ cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%401297613&Name=V*%20UV%20Cet | title=V* UV Cet -- Flare Star | work=[[SIMBAD]] | publisher=[[Centre de Données astronomiques de Strasbourg]] | accessdate=2009-12-16}}</ref>
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| In approximately 31,500 years, Luyten 726-8 will have a close encounter with [[Epsilon Eridani]] at the minimal distance of about 0.93 [[ly]]. Luyten 726-8 can penetrate a conjectured [[Oort cloud]] about Epsilon Eridani, which may gravitationally [[Perturbation (astronomy)|perturb]] some long-period [[comet]]s. The duration of mutual transit of two star systems within 1 [[ly]] from each other is about 4,600 years.<ref>{{cite web
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| | first=Igor Yu. | last=Potemine
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| | date=April 2010 | url=http://arxiv4.library.cornell.edu/abs/1004.1557 | |
| | title=Transit of Luyten 726-8 within 1 ly from Epsilon Eridani
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| | publisher=Cornell University Library
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| | accessdate=2010-04-12}}</ref>
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| Luyten 726-8 is a possible member of the [[Hyades Stream]].<ref>{{ cite journal |author=D. Montes et al.| journal=MNRAS |url=http://astrobib.u-strasbg.fr:2008/cgi-bin/cdsbib?2001MNRAS.328...45M | title=Late-type members of young stellar kinematic groups - I. Single stars. | issue=328 | pages=45–63 | year=2001 | accessdate=2010-04-18}}</ref>
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| ==See also==
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| * [[List of nearest stars]]
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| ==References==
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| {{reflist|30em|refs=
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| <ref name=aj95_1841>{{citation | last1=Geyer | first1=David W. | last2=Harrington | first2=Robert S. | last3=Worley | first3=Charles E. | title=Parallax, orbit, and mass of the visual binary L726-8 | journal=Astronomical Journal | volume=95 | pages=1841–1842 |date=June 1988 | doi=10.1086/114781 | bibcode=1988AJ.....95.1841G }}</ref>
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| <ref name=aaa364_217>{{citation | display-authors=1 | last1=Delfosse | first1=X. | last2=Forveille | first2=T. | last3=Ségransan | first3=D. | last4=Beuzit | first4=J.-L. | last5=Udry | first5=S. | last6=Perrier | first6=C. | last7=Mayor | first7=M. | title=Accurate masses of very low mass stars. IV. Improved mass-luminosity relations | journal=Astronomy and Astrophysics | volume=364 | pages=217–224 |date=December 2000 | bibcode=2000A&A...364..217D |arxiv = astro-ph/0010586 }}</ref>
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| ==Further reading==
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| *{{cite journal |last=Luyten |first=W. J. |authorlink= |coauthors= |year=1949 |month= |title=New stars with proper motions exceeding 0.5" annually |journal=The Astronomical Journal |volume=55 |issue= |pages=15 |doi=10.1086/106322 |url= |accessdate= |quote= |bibcode=1949AJ.....55...15L}}
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| *{{cite journal |last=Durand |first=E. |authorlink= |coauthors=Oberly, J. J.; Tousey, R. |year=1949 |month= |title=Analysis of the First Rocket Ultraviolet Solar Spectra |journal=The Astrophysical Journal |volume=109 |issue= |pages=1 |doi=10.1086/145099 |url= |accessdate= |quote= |bibcode=1949ApJ...109....1D}}
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| ==External links==
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| * http://www.aavso.org/vstar/vsots/fall03.shtml
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| * http://www.solstation.com/stars/luy726-8.htm
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| {{Nearest systems|2}}
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| {{Stars of Cetus}}
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| [[Category:Binary stars]]
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| [[Category:Cetus (constellation)]]
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| [[Category:M-type main-sequence stars]]
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| [[Category:Flare stars|Ceti, UV]]
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| [[Category:Gliese and GJ objects|0065]]
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| [[Category:Objects named with variable star designations]]
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| [[Category:BY Draconis variables]]
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| [[Category:Objects within 10 ly of Earth]]
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