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| {{Starbox begin |
| | In [[wikipedia:Chinese astronomy|Chinese astronomy]] [[wikipedia:Sirius|Sirius]] is known as the star of the 'celestial wolf' ({{CJKV|t=天狼|s=天狼|j=天狼|}}; [[wikipedia:Pinyin|Chinese romanization]]: Tiānláng; [[wikipedia:Romanization of Japanese|Japanese romanization]]: Tenrō). It is located in the [[wikipedia:Well (Chinese constellation)|Mansion of Jǐng]] (井宿).Several cultures also associated the star with a bow and arrows. The Ancient Chinese visualized a large bow and arrow across the southern sky, formed by the constellations of [[wikipedia:Puppis|Puppis]] and [[wikipedia:Canis Major|Canis Major]]. In this, the arrow tip is pointed at the wolf Sirius. |
| name=Sirius [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=name+sirius+a A] / [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=name+sirius+b B] }}{{Starbox image |
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| image=[[Image:Position Alpha Cma.png|250px]] |
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| caption=The position of Sirius }}{{Starbox observe |
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| epoch=[[J2000.0]] ([[International Celestial Reference System|ICRS]]) |
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| constell=[[Canis Major]] |
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| pronounce={{IPA-en|ˈsɪriəs|}}<ref>{{cite web
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| | url=http://dictionary.reference.com/browse/sirius
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| | title=Sirius | work=Dictionary.com Unabridged (v 1.1)
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| | publisher=Random House, Inc
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| | accessdate=2008-04-06 }}</ref> |
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| ra={{RA|06|45|08.9173}}<ref name=simbada /><ref name=cg /> |
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| dec={{DEC|−16|42|58.017}}<ref name=simbada /><ref name=cg>Astrometric data, mirrored by SIMBAD from the [[Hipparcos]] catalogue, pertains to the center of mass of the Sirius system. See §2.3.4, ''[http://www.rssd.esa.int/SA/HIPPARCOS/docs/vol1_all.pdf Volume 1, The Hipparcos and Tycho Catalogues]'', European Space Agency, 1997, and the [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2032349 entry for Sirius] in the Hipparcos catalogue ([[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239].)</ref> |
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| appmag_v=−1.46 (A)<ref name=simbada /> / 8.30 (B)<ref name=wd42166>[http://vizier.u-strasbg.fr/viz-bin/VizieR-S?WD%200642-166 Entry for WD 0642-166], ''A Catalogue of Spectroscopically Identified White Dwarfs'' (August 2006 version), G. P. McCook and E. M. Sion ([[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?III/235A III/235A].)</ref>
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| }}{{Starbox character |
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| class=A1V (A)<ref name=simbada /> / [[White dwarf|DA2]] (B)<ref name=wd42166 />|
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| b-v=0.01 (A)<ref name=simbada /> / −0.03 (B)<ref name=wd42166 />|
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| u-b=−0.05 (A)<ref name=hr2491>[http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HR%202491 Entry for HR 2491], ''Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)'', D. Hoffleit and W. H. Warren, Jr., 1991. ([[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50].)</ref> / −1.04 (B)<ref name=wd42166 />
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| }}{{Starbox astrometry |
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| radial_v=−7.6<ref name=simbada /> |
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| prop_mo_ra=−546.05<ref name=simbada /><ref name=cg /> |
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| prop_mo_dec=−1223.14<ref name=simbada /><ref name=cg /> |
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| parallax=379.21 | parallax_footnote=<ref name=simbada /> |
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| p_error=1.58 |
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| absmag_v=1.42 (A)<ref name=co>For apparent magnitude ''m'' and parallax ''π'', the absolute magnitude ''M<sub>v</sub>'' of Sirius A is given by:
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| :<math>\begin{smallmatrix}M_v\ =\ m + 5 (\log_{10} {\pi} + 1)\ =\ -1.47 + 5 (\log_{10}{0.37921} + 1)\ =\ 1.42\end{smallmatrix}</math>
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| See: {{cite book
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| | first=Roger John | last=Tayler | year=1994
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| | title=The Stars: Their Structure and Evolution
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| | publisher=Cambridge University Press
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| | page=16 | isbn=0521458854 }}</ref> / 11.18 (B)<ref name=wd42166 />}}
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| {{Starbox visbin
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| | reference=<ref name="gatewood">{{cite journal
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| | first=G. D.
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| | last=Gatewood
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| | coauthors=Gatewood, C. V.
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| | title=A study of Sirius
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| | journal=The Astrophysical Journal | year=1978
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| | volume=225 | pages=191–197
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| | url=http://adsabs.harvard.edu/cgi-bin/bib_query?1978ApJ...225..191G
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| | doi=10.1086/156480
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| | doi_brokendate=2010-03-19
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| | ref=harv }} (p. 195.)</ref>
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| | name=α CMa B
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| | period=49.9
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| | axis=7.56
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| | eccentricity=0.592
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| | inclination=136.5
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| | node=44.6
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| | periastron=1894.13
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| | periarg=147.3 }}{{Starbox detail |
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| | metal=[Fe/H] =0.50<ref name="apj548"/> (A)
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| | mass=2.02<ref name="apj_630" /> (A) /<br />0.978<ref name="apj_630" /> (B)|
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| radius=1.711<ref name="apj_630" /> (A) /<br />0.0084 ± 3%<ref name="apj_497">{{cite journal
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| | last=Holberg | first=J. B.
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| | coauthors=Barstow, M. A.; Bruhweiler, F. C.; Cruise, A. M.; Penny, A. J.
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| | title=Sirius B: A New, More Accurate View
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| | journal=The Astrophysical Journal | year=1998 | volume=497 | pages=935–942
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| | url=http://iopscience.iop.org/0004-637X/497/2/935/pdf/36707.pdf
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| | doi=10.1086/305489 | bibcode=1998ApJ...497..935H
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| | ref=harv}}</ref> (B)
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| | rotation=16 km/s<ref name="aaa381"/> (A)
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| | luminosity=25.4<ref name="apj_630" /> (A) /<br />0.026<ref>[[Luminosity#Computing between brightness and luminosity|Bolometric luminosity]] of Sirius B calculated from L=4πR<sup>2</sup>σT<sub>eff</sub><sup>4</sup>. (This simplifies to Ls=(Rs)^2*(Ts)^4, where Ls, Rs and Ts are Luminosity, Radius and Temperature all relative to solar values) See: {{cite book
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| | first=Roger John | last=Tayler | year=1994
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| | title=The Stars: Their Structure and Evolution
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| | publisher=Cambridge University Press
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| | page=16 | isbn=0521458854 }}</ref> (B)
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| | temperature=9,940<ref name="iau224" /> (A) /<br />25,200<ref name="apj_630" /> (B) | |
| | age=2–3 × 10<sup>8</sup><ref name="apj_630" />
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| | gravity=4.33<ref name="iau224" /> (A)/8.57<ref name="apj_497" /> (B)
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| }}{{Starbox catalog |
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| names='''System''': Dog Star, Aschere, Canicula, Al Shira, Sothis,<ref name="Allen1899"/>
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| Mrgavyadha, Lubdhaka,<ref>{{cite book
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| | first=Nagendra Kumar | last=Singh | year=2002
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| | title=Encyclopaedia of Hinduism, A Continuing Series
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| | page=794 | publisher=Anmol Publications PVT. LTD
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| | isbn=8174881689 }}</ref> Tenrōsei,<ref>{{cite book
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| | author=Spahn, Mark; Hadamitzky, Wolfgang; Fujie-Winter, Kimiko
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| | title=The Kanji dictionary | page=724
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| | work=Tuttle language library | year=1996
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| | publisher=Tuttle Publishing | isbn=0804820589 }}</ref> α Canis Majoris (α CMa), 9 Canis Majoris (9 CMa), [[Henry Draper catalogue|HD]] 48915, [[Harvard Revised catalogue|HR]] 2491, [[Bonner Durchmusterung|BD]] −16°1591, [[General Catalogue of Trigonometric Parallaxes|GCTP]] 1577.00 A/B, [[Gliese-Jahreiss catalogue|GJ]] 244 A/B, [[Luyten Half-Second catalogue|LHS]] 219, ADS 5423, LTT 2638, [[Hipparcos catalogue|HIP]] 32349. <br />'''B''': EGGR 49, WD 0642-166.<ref name=simbada /><ref name="simbadb">[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=name+sirius+b Database entry for Sirius B], [[SIMBAD]]. Accessed on line October 23, 2007.</ref><ref>{{cite book
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| | author=van Altena, W. F.; Lee, J. T.; Hoffleit, E. D.
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| | year=1995 | title=The general catalogue of trigonometric parallaxes | edition=4th
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| | publisher=Yale University Observatory }} ([[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/238A I/238A].</ref>
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| }}{{Starbox end}}
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| In [[Chinese astronomy]] the star is known as the star of the 'celestial wolf' ({{CJKV|t=天狼|s=天狼|j=天狼|}}; [[Pinyin|Chinese romanization]]: Tiānláng; [[Romanization of Japanese|Japanese romanization]]: Tenrō;<ref>{{harvard citation|Holberg|2007|loc=p. 22}}</ref> in the [[wikipedia:Well (Chinese constellation)|Mansion of Jǐng]] (井宿).Several cultures also associated the star with a bow and arrows. The Ancient Chinese visualized a large bow and arrow across the southern sky, formed by the constellations of [[Puppis]] and Canis Major. In this, the arrow tip is pointed at the wolf Sirius.
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| <references/>
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| [[Category:Stars]] | | [[Category:Stars]] |
