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Baris 7: {{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 Baris 38: }} {{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 Baris 50: }} {{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]], [[~~planet luar surya~~eksoplanet]] yang ditemukan terletak di dekat [[zona ~~layak~~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. Baris 62: ! Eksentrisitas \|- \| [[Gliese ~~581 e~~581e\|e]] \| ≥1.7 \| 3.14867 ± 0.00039 Baris 68: \| 0 \|- \| [[Gliese ~~581 b~~581b\|b]] \| ≥15.6 \| 5.36841 ± 0.00026 Baris 74: \| 0 \|- \| [[Gliese ~~581 c~~581c\|c]] \| ≥5.6 \| 12.9191 ± 0.0058 Baris 80: \| 0 \|- \| [[Gliese ~~581 g~~581g\|g]] \| ≥3.1 \| 36.562 ± 0.052 Baris 104: == 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}}