Gliese 581: Perbedaan antara revisi

| 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>

| appmag_v = 10.56&nbsp;to&nbsp;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 }} }}

| 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>}}

| names = [[Variable star designation|HO&nbsp;Librae]], [[Variable star designation|HO]]&nbsp;Lib, [[Durchmusterung|BD]]−07°4003, [[Gliese-Jahreiss catalogue|GJ]]&nbsp;581, [[Hipparcos Catalogue|HIP]]&nbsp;74995, [[Luyten Five-Tenths catalogue|LFT]]&nbsp;1195, [[Luyten Half-Second catalogue|LHS]]&nbsp;394, [[Luyten Proper-Motion catalogue|LPM]]&nbsp;564, [[Luyten Two-Tenths catalogue|LTT]]&nbsp;6112, [[New Luyten Two-Tenths catalogue|NLTT]]&nbsp;39886, [[Tycho Catalogue|TYC]]&nbsp;5594-1093-1, Wolf&nbsp;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>

* {{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 }}

* [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://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