Gliese 581: Perbedaan antara revisi
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{{Starbox begin
| name = Gliese 581
}}
{{Starbox image
| image = [[Berkas:SunGliese581.png]]
| caption = Ukuran Matahari (kiri) dan Gliese 581 (kanan).}}
{{Starbox observe
| epoch = J2000.0
| constell = [[Libra]]<ref name="NASA">{{cite web|last1=Smith|first1=Yvette|title=NASA and NSF-Funded Research Finds First Potentially Habitable Exoplanet|url=http://www.nasa.gov/topics/universe/features/gliese_581_feature.html|website=nasa.gov|publisher=NASA|accessdate=9 June 2016|archive-date=2013-03-10|archive-url=https://web.archive.org/web/20130310091735/http://www.nasa.gov/topics/universe/features/gliese_581_feature.html|dead-url=no}}</ref>
| ra = {{RA|15|19|26.8269}}<ref name="Gaia2016"/>
| dec = {{DEC|−07|43|20.189}}<ref name="Gaia2016"/>
| appmag_v = 10.56 to 10.58{{refn|group=note|Gliese 581 is classified as a [[BY Draconis variable]] in the [[General Catalogue of Variable Stars]].<ref>{{cite journal |last=Lopez-Morales |first=M. |display-authors=etal |date=2006 |title=Limits to Transits of the Neptune-mass planet orbiting Gl 581 |journal=[[Publications of the Astronomical Society of the Pacific]] |volume=118 |pages=1506–1509 |doi=10.1086/508904 |quote=V* HO Lib … BY Draconis |arxiv=astro-ph/0609255 |bibcode=2006PASP..118.1506L |issue=849}} (page 2 of pre-print submitted 9 September 2006)</ref> This catalog gives a maximum magnitude of 10.56 and minimum of magnitude 10.58 for a relatively low 20 mmag (0.020 magnitudes) variability.<ref>{{cite web |publisher=[[Sternberg Astronomical Institute]] |title=General Catalogue of Variable Stars Query results |url=http://www.sai.msu.su/groups/cluster/gcvs/cgi-bin/search.cgi?search=HO+Lib |accessdate=2009-04-27 |archive-date=2021-09-23 |archive-url=https://web.archive.org/web/20210923213559/http://www.sai.msu.su/groups/cluster/gcvs/cgi-bin/search.cgi?search=HO+Lib |dead-url=no }}</ref> For full data see [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/html/ data description] and {{cite web |publisher=Sternberg Astronomical Institute |url=http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat |title=The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars |accessdate=2009-04-27 |archive-date=2017-06-20 |archive-url=https://web.archive.org/web/20170620004609/http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat |dead-url=yes }} }}
}}
{{Starbox character
| class = M3V<ref name="bonfils"><cite id="bonfils">{{cite journal |last=Bonfils |first=X. |display-authors=etal |date=2005 |title=The HARPS search for southern extra-solar planets VI: A Neptune-mass planet around the nearby M dwarf Gl 581 |journal=[[Astronomy and Astrophysics Letters]] |volume=443 |pages=L15–L18 |bibcode=2005A&A...443L..15B |doi=10.1051/0004-6361:200500193 |arxiv=astro-ph/0509211 |issue=3 }}</cite></ref>
| b-v = 1.61<ref name="sb0">{{ cite simbad | title=GJ 581 | accessdate=2008-08-21 }}</ref>
| variable = [[BY Draconis variable|BY Dra]]<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>{{refn|group=note|In 1994 Edward Weis concluded that Gliese 581, like half the 43 dwarf M stars he studied over a multi-year period, showed long term variability (and page 1137, Fig 1 shows Gliese 581 had magnitude 10.58 in 1982 and between 10.57 and 10.56 from 1985 to 1990).<ref>{{cite journal |last=Weis |first=E. W. |date=1994 |title=Long term variability in dwarf M stars |journal=[[The Astronomical Journal]] |volume=107 |issue=3 |pages=1138 |bibcode=1994AJ....107.1135W |doi=10.1086/116925 }}</ref> Bonfils noted in 2005 that Gliese 581 "has been classified as a variable star (HO Lib), but its variability (Weis 1994) is only marginally significant. If real it would be on a time scale of several years, with short term variability being at most ∼0.006 mag."<ref>[[#bonfils|Bonfils]] page L15</ref> Measurements by [[Microvariability and Oscillations of STars telescope|MOST]] showed short term variability of about 5 mmag (half a percent) over a period of a few weeks.<ref>{{cite web |last=Matthews |first=J. M. |display-authors=etal |date=2007 |title=MOST Exoplanet System Photometry |url=http://nexsci.caltech.edu/workshop/2007/Matthews.pdf |pages=80 |accessdate=2009-04-27 |format=PDF |archive-date=2022-10-07 |archive-url=https://web.archive.org/web/20221007015654/https://nexsci.caltech.edu/workshop/2007/Matthews.pdf |dead-url=no }}</ref>}}
}}
{{Starbox astrometry
| radial_v = −9.5 ± 0.5<ref name="sb0" />
| prop_mo_ra = −1 221.289 ± 0.160<ref name="Gaia2016"/>
| prop_mo_dec = −97.237 ± 0.105<ref name="Gaia2016"/>
| parallax = 158.64
| p_error = 0.35
| parallax_footnote = <ref name="Gaia2016"/>
| absmag_v = 11.6<ref>From apparent magnitude and parallax.</ref>
}}
{{Starbox detail
| mass = 0.31<ref name="epe">{{cite web |title=Star: Gliese 581 |url=http://exoplanet.eu/star.php?st=Gl+581 |publisher=[[Extrasolar Planets Encyclopaedia]] |quote=Mass 0.31 M<sub>Sun</sub>, Age {{val|8|+3|-1}} Gyr |deadurl=yes |archiveurl=https://www.webcitation.org/68uUsn7yC?url=http://exoplanet.eu/star.php?st=Gl+581 |archivedate=4 July 2012 |df=dmy-all }}</ref>
| radius = {{val|0.299|0.010}}<ref name="von Braun2011"/>
| luminosity_bolometric= 0.013<ref name="bonfils" />
| luminosity_visual = 0.002<ref group="note" name="luminosity_visual" />
| temperature = {{nowrap|3,480 ± 48}}<ref name="apj653">{{cite journal |last=Bean |first=J. L |last2=Benedict |first2=G. F. |last3=Endl |first3=M. |date=2006 |title=Metallicities of M Dwarf Planet Hosts from Spectral Synthesis |journal=[[Astrophysical Journal Letters]] |volume=653 | issue=1 | pages=L65–L68 |bibcode=2006ApJ...653L..65B |doi=10.1086/510527|arxiv = astro-ph/0611060 }}</ref>
| gravity = {{val|4.92|0.10}}<ref name=apj653 />
| metal_fe = −0.33 ± 0.12<ref name="apj653" />
| age_gyr = [[1 E17 s|7 to 11]]<ref name="epe" /><ref>[[#Selsis|Selsis 3.4-page 1382]] "lower limit of the age that, considering the associated uncertainties, could be around 7 Gyr", "preliminary estimate", "should not be above 10–11 Gyr"</ref>
| rotation = {{Val|132.5|6.3|u=d}}<ref name=mnras452_3_2745 />
}}
{{Starbox catalog
| names = [[Variable star designation|HO Librae]], [[Variable star designation|HO]] Lib, [[Durchmusterung|BD]]−07°4003, [[Gliese-Jahreiss catalogue|GJ]] 581, [[Hipparcos Catalogue|HIP]] 74995, [[Luyten Five-Tenths catalogue|LFT]] 1195, [[Luyten Half-Second catalogue|LHS]] 394, [[Luyten Proper-Motion catalogue|LPM]] 564, [[Luyten Two-Tenths catalogue|LTT]] 6112, [[New Luyten Two-Tenths catalogue|NLTT]] 39886, [[Tycho Catalogue|TYC]] 5594-1093-1, Wolf 562.<ref name=sb0 /><ref name="catl">{{cite web |title=Entry 5594-1093-1 |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/tyc_main&recno=585779 |work=The Hipparcos and Tycho Catalogues |publisher=[[Centre de données astronomiques de Strasbourg]] |id=ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239] |access-date=2018-05-18 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303193228/http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I%2F239%2Ftyc_main&recno=585779 |dead-url=no }}</ref>
}}
{{Starbox reference
|Simbad = gl+581|sn=The star
|Simbad2 = gl+581+e|sn2=e
|Simbad3 = gl+581+b|sn3=b
|Simbad4 = gl+581+c|sn4=c
|Simbad5 = gl+581+d|sn5=d
|Simbad6 = gl+581+f|sn6=f (artifact)
|Simbad7 = gl+581+g|sn7=g
}}
{{Starbox end}}
'''Gliese 581''' ({{pronEng|ˈgliːzə}}) atau '''HO Librae''' adalah [[bintang]] [[katai merah]] dengan tipe spektrum M3V, terletak sejauh 20.3 tahun cahaya dari [[Bumi]]. Observasi menunjukan bahwa bintang ini diorbit oleh sedikitnya empat planet, yaitu Gliese 581 b, c, d, dan e. Bintang ini mendapat perhatian setelah [[Gliese 581 c]], [[eksoplanet]] yang ditemukan terletak di dekat [[zona laik hidup]] bintang ini pada April 2007.
Pada akhir September 2010. telah dketemukan lagi dua planet yang mengelilingi bintang ini, yaitu Gliese 581 f dan g.
{| class="wikitable sortable"
|-
! Nama
! Massa <br />([[Massa bumi|M<sub>⊕</sub>]])
! Periode orbit <br />([[hari]])
! Aksis semimayor <br />([[Satuan astronomi|AU]])
! Eksentrisitas
|-
| [[Gliese 581e|e]]
| ≥1.7
| 3.14867 ± 0.00039
| 0.0284533 ± 0.0000023
| 0
|-
| [[Gliese 581b|b]]
| ≥15.6
| 5.36841 ± 0.00026
| 0.0406163 ± 0.0000013
| 0
|-
| [[Gliese 581c|c]]
| ≥5.6
| 12.9191 ± 0.0058
| 0.072993 ± 0.000022
| 0
|-
| [[Gliese 581g|g]]
| ≥3.1
| 36.562 ± 0.052
| 0.14601 ± 0.00014
| 0
|-
| [[Gliese 581 d|d]]
| ≥5.6
| 66.87 ± 0.13
| 0.21847 ± 0.00028
| 0
|-
| [[Gliese 581 f|f]]
| ≥7.0
| 433 ± 13
| 0.758 ± 0.015
| 0
|}
== Referensi ==
{{reflist}}
== Pranala luar ==
{{wikinews|First earthlike planet outside solar system discovered}}
* {{cite web |url=http://www.space.com/scienceastronomy/070424_hab_exoplanet.html |title=SPACE.com - Major Discovery: New Planet Could Harbor Water and Life |publisher=Space.com |date= |accessdate=2008-10-20 |archive-date=2010-12-24 |archive-url=https://web.archive.org/web/20101224061707/http://www.space.com/scienceastronomy/070424_hab_exoplanet.html |dead-url=no }}
* {{cite web |url=http://www.solstation.com/stars/gl581.htm |title=Gliese 581 / HO Librae |publisher=Solstation.com |date= |accessdate=2008-10-20 |archive-date=2008-10-10 |archive-url=https://web.archive.org/web/20081010163609/http://solstation.com/stars/gl581.htm |dead-url=no }}
* {{cite web |url=http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20070424/new_planet_070424/20070424?hub=SciTech |title=CTV.ca | Earth-like planet found that may support life |publisher=Ctv.ca |date=Updated Wed. April 25 2007 11:05 AM ET |accessdate=2008-10-20 |archive-date=2007-10-23 |archive-url=https://web.archive.org/web/20071023075235/http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20070424/new_planet_070424/20070424?hub=SciTech |dead-url=yes }}
* [http://exoplanet.eu/star.php?st=Gl+581 '''Extrasolar Planets Encyclopaedia''': Gl 581] {{Webarchive|url=https://web.archive.org/web/20120510094317/http://exoplanet.eu/star.php?st=Gl+581 |date=2012-05-10 }}
* [http://www.satsig.net/seticalc.htm Do your own simulation of radio communications to or from Gliese 581] {{Webarchive|url=https://web.archive.org/web/20081223194115/http://www.satsig.net/seticalc.htm |date=2008-12-23 }}
* [http://www.sciam.com/article.cfm?articleID=25A261F0-E7F2-99DF-313249A4883E6A86&chanID=sa007 All Wet? Astronomers Claim Discovery of Earth-like Planet] {{Webarchive|url=https://web.archive.org/web/20071013164438/http://www.sciam.com/article.cfm?articleID=25A261F0-E7F2-99DF-313249A4883E6A86&chanID=sa007 |date=2007-10-13 }}, [[Scientific American]]
* [http://cc.joensuu.fi/~tniemi/starmaps/GJ581.png Position of Gliese 581 marked on local space.] {{Webarchive|url=http://webarchive.nationalarchives.gov.uk/20100604044125/http%3A//cc.joensuu.fi/%7Etniemi/starmaps/GJ581.png |date=2010-06-04 }} (Top right corner)
* [http://www.allthesky.com/constellations/lib35.html Photo of Constellation Libra with Gliese 581] {{Webarchive|url=https://web.archive.org/web/20090206043707/http://allthesky.com/constellations/lib35.html |date=2009-02-06 }}
* [http://cosmographica.com/gallery/extrasolar/Gliese581c/index.html Artist conceptions of planets of Gliese 581] {{Webarchive|url=https://web.archive.org/web/20110928044147/http://cosmographica.com/gallery/extrasolar/Gliese581c/index.html |date=2011-09-28 }}
* [http://gnews.wustl.edu/gn131/gliese581c.htm Speculation about geology/geochemistry of Gliese 581c] {{Webarchive|url=https://web.archive.org/web/20070617225754/http://gnews.wustl.edu/gn131/gliese581c.htm |date=2007-06-17 }} [http://geochemsoc.org/ '''The Geochemical Society'''] {{Webarchive|url=https://web.archive.org/web/20090411110655/http://www.geochemsoc.org/ |date=2009-04-11 }}
* [http://news-info.wustl.edu/news/page/normal/9607.html Computer models suggest planetary and extrasolar planet atmospheres - A gas, gas, gas '''Washington University in St. Louis'''] {{Webarchive|url=https://web.archive.org/web/20080705130225/http://news-info.wustl.edu/news/page/normal/9607.html |date=2008-07-05 }}
* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] {{Webarchive|url=https://web.archive.org/web/20160505160348/http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ |date=2016-05-05 }} by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
{{bintang-stub}}
[[Kategori:Rasi bintang Libra]]
[[Kategori:Bintang variabel]]
[[Kategori:Sistem keplanetan]]
[[Kategori:Deret utama merah]]
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