Gliese 581

Gliese 581
	; Ukuran Matahari (kiri) dan Gliese 581 (kanan).
Data pengamatan; Epos J2000.0 Ekuinoks J2000.0
Rasi bintang	Libra
Asensio rekta	15j 19m 26.8269d
Deklinasi	−07° 43′ 20.189″
Magnitudo tampak (V)	10.56 to 10.58
Ciri-ciri
Kelas spektrum	M3V
Indeks warna B−V	1.61
Jenis variabel	BY Dra
Astrometri
Kecepatan radial (Rv)	−9.5 ± 0.5 km/s
Gerak diri (μ)	RA: −1 221.289 ± 0.160 mdb/thn ; Dek.: −97.237 ± 0.105 mdb/thn
Paralaks (π)	158,64±0,35 mdb
Jarak	20,56 ± 0,05 tc ; (6,30 ± 0,01 pc)
Magnitudo mutlak (MV)	11.6
Detail
Massa	0.31 M☉
Radius	0,299±0,010 R☉
Luminositas (bolometrik)	0.013 L☉
Luminositas (visual, LV)	0.002 L☉
Gravitasi permukaan (log g)	4,92±0,10
Suhu	3,480 ± 48 K
Metalisitas [Fe/H]	−0.33 ± 0.12
Rotasi	132,5±6,3 h
Usia	7 to 11 gigatahun
Penamaan lain
	HO Librae, HO Lib, BD−07°4003, GJ 581, HIP 74995, LFT 1195, LHS 394, LPM 564, LTT 6112, NLTT 39886, TYC 5594-1093-1, Wolf 562.
Referensi basis data
SIMBAD	The star
	e
	b
	c
	d
	f (artifact)
	g

Gliese 581 (pengucapan: /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.

Pada akhir September 2010. telah dketemukan lagi dua planet yang mengelilingi bintang ini, yaitu Gliese 581 f dan g.

Nama	Massa (M_⊕)	Periode orbit (hari)	Aksis semimayor (AU)
e	≥1.7	3.14867 ± 0.00039	0.0284533 ± 0.0000023
b	≥15.6	5.36841 ± 0.00026	0.0406163 ± 0.0000013
c	≥5.6	12.9191 ± 0.0058	0.072993 ± 0.000022
g	≥3.1	36.562 ± 0.052	0.14601 ± 0.00014
d	≥5.6	66.87 ± 0.13	0.21847 ± 0.00028
f	≥7.0	433 ± 13	0.758 ± 0.015

Pranala luar

"SPACE.com - Major Discovery: New Planet Could Harbor Water and Life". Space.com. Diakses tanggal 2008-10-20.
"Gliese 581 / HO Librae". Solstation.com. Diakses tanggal 2008-10-20.
"CTV.ca | Earth-like planet found that may support life". Ctv.ca. Updated Wed. April 25 2007 11:05 AM ET. Diakses tanggal 2008-10-20.
Extrasolar Planets Encyclopaedia: Gl 581
Do your own simulation of radio communications to or from Gliese 581
All Wet? Astronomers Claim Discovery of Earth-like Planet, Scientific American
Position of Gliese 581 marked on local space. (Top right corner)
Photo of Constellation Libra with Gliese 581
Artist conceptions of planets of Gliese 581
Speculation about geology/geochemistry of Gliese 581c The Geochemical Society
Computer models suggest planetary and extrasolar planet atmospheres - A gas, gas, gas Washington University in St. Louis
Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona

Artikel bertopik bintang ini adalah sebuah rintisan. Anda dapat membantu Wikipedia dengan mengembangkannya.

^ Smith, Yvette. "NASA and NSF-Funded Research Finds First Potentially Habitable Exoplanet". nasa.gov. NASA. Diakses tanggal 9 June 2016.
^ ^a ^b ^c ^d ^e Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama Gaia2016
^ Lopez-Morales, M.; et al. (2006). "Limits to Transits of the Neptune-mass planet orbiting Gl 581". Publications of the Astronomical Society of the Pacific. 118 (849): 1506–1509. arXiv:astro-ph/0609255  . Bibcode:2006PASP..118.1506L. doi:10.1086/508904. V* HO Lib … BY Draconis (page 2 of pre-print submitted 9 September 2006)
^ "General Catalogue of Variable Stars Query results". Sternberg Astronomical Institute. Diakses tanggal 2009-04-27.
^ ^a ^b Bonfils, X.; et al. (2005). "The HARPS search for southern extra-solar planets VI: A Neptune-mass planet around the nearby M dwarf Gl 581". Astronomy and Astrophysics Letters. 443 (3): L15–L18. arXiv:astro-ph/0509211  . Bibcode:2005A&A...443L..15B. doi:10.1051/0004-6361:200500193.
^ ^a ^b ^c "GJ 581". SIMBAD. Centre de données astronomiques de Strasbourg. Diakses tanggal 2008-08-21.
^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ Weis, E. W. (1994). "Long term variability in dwarf M stars". The Astronomical Journal. 107 (3): 1138. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.
^ Bonfils page L15
^ Matthews, J. M.; et al. (2007). "MOST Exoplanet System Photometry" (PDF). hlm. 80. Diakses tanggal 2009-04-27.
^ From apparent magnitude and parallax.
^ ^a ^b "Star: Gliese 581". Extrasolar Planets Encyclopaedia. Diarsipkan dari versi asli tanggal 4 July 2012. Mass 0.31 M_Sun, Age 8+3
−1 Gyr
^ Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama von Braun2011
^ ^a ^b ^c Bean, J. L; Benedict, G. F.; Endl, M. (2006). "Metallicities of M Dwarf Planet Hosts from Spectral Synthesis". Astrophysical Journal Letters. 653 (1): L65–L68. arXiv:astro-ph/0611060  . Bibcode:2006ApJ...653L..65B. doi:10.1086/510527.
^ Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama mnras452_3_2745
^ 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"
^ "Entry 5594-1093-1". The Hipparcos and Tycho Catalogues. Centre de données astronomiques de Strasbourg. ID I/239.

Kesalahan pengutipan: Ditemukan tag <ref> untuk kelompok bernama "note", tapi tidak ditemukan tag <references group="note"/> yang berkaitan

[NASA-1] Smith, Yvette. "NASA and NSF-Funded Research Finds First Potentially Habitable Exoplanet". nasa.gov. NASA. Diakses tanggal 9 June 2016.

[Gaia2016-2] Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama Gaia2016

[3] Lopez-Morales, M.; et al. (2006). "Limits to Transits of the Neptune-mass planet orbiting Gl 581". Publications of the Astronomical Society of the Pacific. 118 (849): 1506–1509. arXiv:astro-ph/0609255  . Bibcode:2006PASP..118.1506L. doi:10.1086/508904. V* HO Lib … BY Draconis (page 2 of pre-print submitted 9 September 2006)

[4] "General Catalogue of Variable Stars Query results". Sternberg Astronomical Institute. Diakses tanggal 2009-04-27.

[bonfils-6] Bonfils, X.; et al. (2005). "The HARPS search for southern extra-solar planets VI: A Neptune-mass planet around the nearby M dwarf Gl 581". Astronomy and Astrophysics Letters. 443 (3): L15–L18. arXiv:astro-ph/0509211  . Bibcode:2005A&A...443L..15B. doi:10.1051/0004-6361:200500193.

[sb0-7] "GJ 581". SIMBAD. Centre de données astronomiques de Strasbourg. Diakses tanggal 2008-08-21.

[gcvs-8] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

[9] Weis, E. W. (1994). "Long term variability in dwarf M stars". The Astronomical Journal. 107 (3): 1138. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.

[10] Bonfils page L15

[11] Matthews, J. M.; et al. (2007). "MOST Exoplanet System Photometry" (PDF). hlm. 80. Diakses tanggal 2009-04-27.

[13] From apparent magnitude and parallax.

[epe-14] "Star: Gliese 581". Extrasolar Planets Encyclopaedia. Diarsipkan dari versi asli tanggal 4 July 2012. Mass 0.31 M_Sun, Age 8+3
−1 Gyr

[von_Braun2011-15] Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama von Braun2011

[apj653-17] Bean, J. L; Benedict, G. F.; Endl, M. (2006). "Metallicities of M Dwarf Planet Hosts from Spectral Synthesis". Astrophysical Journal Letters. 653 (1): L65–L68. arXiv:astro-ph/0611060  . Bibcode:2006ApJ...653L..65B. doi:10.1086/510527.

[mnras452_3_2745-18] Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama mnras452_3_2745

[19] 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"

[catl-20] "Entry 5594-1093-1". The Hipparcos and Tycho Catalogues. Centre de données astronomiques de Strasbourg. ID I/239.

[1]

[2]

[note 1]

[5]

[6]

[7]

[note 2]

[11]

[12]

[13]

[note 3]

[14]

[15]

[16]

[17]

Data pengamatan Epos J2000.0 Ekuinoks J2000.0
Ukuran Matahari (kiri) dan Gliese 581 (kanan).
Rasi bintang	Libra^[1]
Asensio rekta	15^j 19^m 26.8269^d^[2]
Deklinasi	−07° 43′ 20.189″^[2]
Magnitudo tampak (V)	10.56 to 10.58^{[note 1]}
Ciri-ciri
Kelas spektrum	M3V^[5]
Indeks warna B−V	1.61^[6]
Jenis variabel	BY Dra^[7]^{[note 2]}
Astrometri

Kecepatan radial (R_v)	−9.5 ± 0.5^[6] km/s
Gerak diri (μ)	RA: −1 221.289 ± 0.160^[2] mdb/thn Dek.: −97.237 ± 0.105^[2] mdb/thn
Paralaks (π)	158,64±0,35^[2] mdb
Jarak	20,56 ± 0,05 tc (6,30 ± 0,01 pc)
Magnitudo mutlak (M_V)	11.6^[11]

Detail

Massa	0.31^[12] M_☉
Radius	0,299±0,010^[13] R_☉
Luminositas (bolometrik)	0.013^[5] L_☉
Luminositas (visual, L_V)	0.002^{[note 3]} L_☉
Gravitasi permukaan (log g)	4,92±0,10^[14]
Suhu	3,480 ± 48^[14] K
Metalisitas [Fe/H]	−0.33 ± 0.12^[14]
Rotasi	132,5±6,3 h^[15]
Usia	7 to 11^[12]^[16] gigatahun

Penamaan lain
HO Librae, HO Lib, BD−07°4003, GJ 581, HIP 74995, LFT 1195, LHS 394, LPM 564, LTT 6112, NLTT 39886, TYC 5594-1093-1, Wolf 562.^[6]^[17]
Referensi basis data
SIMBAD	The star
	e
	b
	c
	d
	f (artifact)
	g