Gliese 581: Perbedaan antara revisi
Konten dihapus Konten ditambahkan
k Bot: Penggantian teks otomatis (-{{astronomi-stub}}/{{angkasa-stub}}; +{{bintang-stub}}) |
Infobox Tag: Suntingan perangkat seluler Suntingan peramban seluler |
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{{Starbox begin
| name = Gliese 581
}}
{{Starbox image
| image = [[File: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}}</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}}</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}} }}
}}
{{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 }}</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] }}</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]], [[planet luar surya]] yang ditemukan terletak di dekat [[zona layak hidup]] bintang ini pada April 2007.
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