新規更新May 26, 2019 at 03:20AM
【外部リンク】
HD 161693
SenseiAC : Ajout rapide de : + astronomie
{| class="infobox" style="width: 22em; font-size: 88%; line-height: 1.5em"
|+ id="5" style="font-size: 125%; font-weight: bold" |Alruba
| colspan="2" style="text-align:center;" |<div style="text-align: center; margin-left:auto; margin-right:auto"><div class="center">
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<div style="position:relative; background-color:#FFFFFF; ;">[[File:Draco_constellation_map.svg|288x288px]]<div style="position: absolute; z-index: 2; height: 0; width: 0; margin: 0; padding: 0;
top: 239px;
left: 67px; ">
<div style="position: relative; z-index: 3; line-height: 0; text-align: center;
width: 10px;
left: -5px;
top: -5px;">[[File:Red_circle.svg|10x10px]]</div><div style="position: relative; z-index: 4; font-size: 90%; line-height: 111%; width: 6em;
top: -1.5em; left: 0.5em; text-align: left;"></div>
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</div>Location of Alruba (circled)</div>
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! colspan="2" style="text-align: center; background-color: #FFFFC0;" |Observation data<br /><br /><small> [[Epoch (astronomy)|Epoch]] [[J2000.0]] [[Equinox (celestial coordinates)|Equinox]] [[J2000.0]]</small>
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! style="text-align:left" |[[Constellation]]
|[[Draco (constellation)|Draco]]
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! style="text-align:left" |<span class="nowrap">[[Right ascension]]</span>
| 17<sup>h</sup> 43<sup>m</sup> 59.17049<sup>s</sup><ref name="dr2"><cite class="citation journal">Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "''Gaia'' Data Release 2: Summary of the contents and survey properties". ''[[Astronomy & Astrophysics]]''. '''616'''. A1. [[arXiv]]:<span class="cs1-lock-free" title="Freely accessible">[//arxiv.org/abs/1804.09365 1804.09365]</span>. [[Bibcode]]:<span class="cs1-lock-free" title="Freely accessible">[[bibcode:2018A&A...616A...1G|2018A&A...616A...1G]]</span>. [[Digital object identifier|doi]]:<span class="cs1-lock-free" title="Freely accessible">[[doi:10.1051/0004-6361/201833051|10.1051/0004-6361/201833051]]</span>.</cite></ref>
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! style="text-align:left" |[[Declination]]
| +54° 48′ 06.1637″<ref name="dr2" />
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! style="text-align:left" |<span class="nowrap">[[Apparent magnitude|Apparent magnitude]] <small>(V)</small></span>
|5.76<ref name="ubv"><cite class="citation" id="CITEREFOja1985">Oja, T. (March 1985), "UBV photometry of stars whose positions are accurately known. II", ''Astronomy and Astrophysics Supplement Series'', '''59''': 461–464, [[Bibcode]]:[[bibcode:1985A&AS...59..461O|1985A&AS...59..461O]]</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref>
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! colspan="2" style="background-color: #FFFFC0; text-align: center;" |Characteristics
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! style="text-align:left" |[[Stellar classification|Spectral type]]
|A0V<ref name="abt"><cite class="citation journal">Abt, Helmut A; Morrell, Nidia I (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". ''The Astrophysical Journal Supplement Series''. '''99''': 135. [[Bibcode]]:[[bibcode:1995ApJS...99..135A|1995ApJS...99..135A]]. [[Digital object identifier|doi]]:[[doi:10.1086/192182|10.1086/192182]].</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref>
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! colspan="2" style="background-color: #FFFFC0; text-align: center;" |[[Astrometry]]
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! colspan="2" style="text-align: center" |
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|'''[[Radial velocity]] <small>(R<sub>v</sub>)</small>'''
|<span class="nowrap">−2.0</span><ref name="pulkovo"><cite class="citation journal">Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". ''Astronomy Letters''. '''32''' (11): 759–771. [[arXiv]]:<span class="cs1-lock-free" title="Freely accessible">[//arxiv.org/abs/1606.08053 1606.08053]</span>. [[Bibcode]]:[[bibcode:2006AstL...32..759G|2006AstL...32..759G]]. [[Digital object identifier|doi]]:[[doi:10.1134/S1063773706110065|10.1134/S1063773706110065]].</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref> km/s
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|'''[[Proper motion]] <small>(μ)</small>'''
| <abbr title="Right Ascension">RA:</abbr> 17.450<ref name="dr2" /> [[Milliarcsecond|mas]]/[[Year|yr]] <br /><br /> <abbr title="Declination">Dec.:</abbr> −18.125<ref name="dr2" /> [[Milliarcsecond|mas]]/[[Year|yr]]
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|'''[[Stellar parallax|Parallax]] <small>(π)</small>'''
|7.1436 ± 0.0605<ref name="dr2" /> [[Milliarcsecond|mas]]
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|'''[[Distance (astronomy)|Distance]]'''
|457 ± 4 [[Light-year|ly]] <br /><br />(140 ± 1 [[Parsec|pc]])
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! colspan="2" style="text-align: center" |
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! colspan="2" style="background-color: #FFFFC0; text-align: center;" |Details
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! colspan="2" style="text-align: center" |
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|'''[[Stellar mass|Mass]]'''
|2.4<ref name="gullikson"><cite class="citation journal">Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars". ''The Astronomical Journal''. '''152''' (2): 40. [[arXiv]]:<span class="cs1-lock-free" title="Freely accessible">[//arxiv.org/abs/1604.06456 1604.06456]</span>. [[Bibcode]]:[[bibcode:2016AJ....152...40G|2016AJ....152...40G]]. [[Digital object identifier|doi]]:[[doi:10.3847/0004-6256/152/2/40|10.3847/0004-6256/152/2/40]].</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref> [[Solar mass|<var>M</var><sub>☉</sub>]]
|- style="vertical-align:baseline;"
|'''[[Surface gravity]] <small>(log ''g'')</small>'''
|4.0<ref name="gullikson" /> [[Centimetre–gram–second system of units|cgs]]
|- style="vertical-align:baseline;"
|'''[[Effective temperature|Temperature]]'''
|10,000<ref name="gullikson" /> [[Kelvin|K]]
|- style="vertical-align:baseline;"
|'''[[Stellar evolution|Age]]'''
|58<ref name="gullikson" /> [[Megayear|Myr]]
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! colspan="2" style="text-align: center" |
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! colspan="2" style="background-color: #FFFFC0; text-align: center;" |[[Star catalogue|Other designations]]
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| colspan="2" |<div style="width: 250px;"> Alruba, [[Henry Draper Catalogue|HD]] 161693, [[Bright Star Catalogue|HR]] 6618, [[Durchmusterung|BD]]+53° 1978, [[Hipparcos Catalogue|HIP]] 86782, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 30538<ref name="SIMBAD"><cite class="citation">[http://bit.ly/2ExLPNV "HD 161693 -- Star"], ''SIMBAD Astronomical Database'', [[Centre de Données astronomiques de Strasbourg]]<span class="reference-accessdate">, retrieved <span class="nowrap">2018-07-01</span></span>.</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref> </div>
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! colspan="2" style="background-color: #FFFFC0; text-align: center;" |Database references
|- style="vertical-align: top;"
|'''[[SIMBAD]]'''
|[http://bit.ly/2X4inWQ data]
|}
'''HD 161693''', aussi désignée '''HR 6618''' et [[Liste des noms d'étoiles et de planètes officiellement reconnus par l'Union astronomique internationale|officiellement nommée]] '''Alruba'''<ref name="IAU-LSN"><cite class="citation web">[http://bit.ly/2g8ocQv "Naming Stars"]. IAU.org<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-07-01</span></span>.</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref>, est une [[étoile]] de la [[constellation circumpolaire]] boréale du [[Dragon (constellation)|Dragon]]. D'après les mesures de [[Parallaxe stellaire|parallaxe]] obtenues lors de la mission [[Gaia (satellite)|''Gaia'']], elle se situe à environ 457 [[Année-lumière|années-lumière]] (140 [[Parsec|parsecs]]) du [[Soleil]].
== Nomenclature ==
HD 161693 est l'entrée de l'étoile dans le [[catalogue Henry Draper]] et HR 6618 celle dans le [[Bright Star Catalogue]].
Elle porte le [[Liste de noms traditionnels d'étoiles|nom traditionnel]] [[arabe]] الربع ''Al Rubaʽ'' , « le chamelon » (spécifiquement un jeune [[chameau]] né au [[printemps]]), membre de l'[[astérisme]] des [[Chamelles]] de l' [[astronomie arabe]] ancienne<ref name="Allen"><cite class="citation book">[[Richard Hinckley Allen|Allen, R. H.]] (1963). ''[[Star Names: Their Lore and Meaning]]'' (rep. ed.). [[New York City|New York]], [[New York (state)|NY]]: [[Dover Publications]] Inc. p. 207–212. [[International Standard Book Number|ISBN]] [[Special:BookSources/0-486-21079-0|<bdi>0-486-21079-0</bdi>]].</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref> <ref name="Garfinkle"><cite class="citation book">Garfinkle, Robert A. (2008). [http://bit.ly/2X1GNjM ''Star-Hopping: Your Visa to Viewing the Universe''] (2nd ed.). [[Cambridge University Press]]. p. 183. [[International Standard Book Number|ISBN]] [[Special:BookSources/978-0521598897|<bdi>978-0521598897</bdi>]]<span class="reference-accessdate">. Retrieved <span class="nowrap">16 October</span> 2016</span>.</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref>.
En 2016, l'[[Union astronomique internationale]] (UAI) a organisé un [[Groupe de travail de l'Union astronomique internationale sur les noms d'étoiles|groupe de travail sur les noms d'étoiles]]<ref name="WGSN"><cite class="citation web">[http://bit.ly/2gsSIkP "International Astronomical Union | IAU"]. ''www.iau.org''<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-07-01</span></span>.</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref> afin de répertorier et de normaliser les noms propres pour les étoiles. Le groupe de travail a approuvé le nom ''Alruba'' pour cette étoile le 1er juin 2018 et il est désormais inscrit sur la [[Liste des noms d'étoiles et de planètes officiellement reconnus par l'Union astronomique internationale|liste des noms d'étoiles approuvés par l'UAI]]<ref name="IAU-LSN"><cite class="citation web">[http://bit.ly/2g8ocQv "Naming Stars"]. IAU.org<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-07-01</span></span>.</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref>.
== Propriétés ==
Cette étoile est une [[étoile blanche de la séquence principale]] de [[type spectral]] A0V<ref name="abt"><cite class="citation journal">Abt, Helmut A; Morrell, Nidia I (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". ''The Astrophysical Journal Supplement Series''. '''99''': 135. [[Bibcode]]:[[bibcode:1995ApJS...99..135A|1995ApJS...99..135A]]. [[Digital object identifier|doi]]:[[doi:10.1086/192182|10.1086/192182]].</cite><templatestyles src="Module:Citation/CS1/styles.css"></templatestyles></ref>.
== Références ==
[[Catégorie:Étoile de type spectral AV]]
[[Catégorie:Objet du catalogue Henry Draper]]
[[Catégorie:Constellation du Dragon]]
[[Catégorie:Pages avec des traductions non relues]]
http://bit.ly/2X5PXf3
