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| {{DISPLAYTITLE:Tau<sup>2</sup> Aquarii}}
| | Alyson is what my husband loves to call me but I don't like when people use my full title. One of the things she enjoys most is canoeing and she's been doing it for fairly a while. For years he's been living in Mississippi and he doesn't plan on altering it. Office supervising is what she does for a living.<br><br>Also visit my website; spirit messages ([http://brazil.amor-amore.com/irboothe Link Website]) |
| :''For other star systems with this [[Bayer designation]], see [[Tau Aquarii]].''
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| {{Starbox begin
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| | name=τ<sup>2</sup> Aquarii
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| }}
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| {{Starbox image
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| | image =
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| <div style="position: relative">[[File:Aquarius IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings]]
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| <div style="position: absolute; left: 37.2%; top: 48.2%">[[File:Cercle rouge 100%.svg|12px]]</div>
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| </div>
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| | caption = Location of τ<sup>1</sup> Aquarii (circled)
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| }}
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| {{Starbox observe
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| | epoch = J2000
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| | ra = {{RA|22|49|35.50157}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|–13|35|33.4767}}<ref name=aaa474_2_653/>
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| | appmag_v = +4.042<ref name=sps1966/>
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| | constell = [[Aquarius (constellation)|Aquarius]]
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| }}
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| {{Starbox character
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| | class = K5 III<ref name=houk1978/>
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| | b-v = +1.566<ref name=sps1966/>
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| | u-b = +1.948<ref name=sps1966/>
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| | variable =
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| }}
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| {{Starbox astrometry
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| | radial_v = +1.0<ref name=scfs/>
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| | prop_mo_ra = –13.71<ref name=aaa474_2_653/>
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| | prop_mo_dec = –39.03<ref name=aaa474_2_653/>
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| | parallax = 10.27
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| | p_error = 0.29
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| | parallax_footnote = <ref name=aaa474_2_653/>
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| | absmag_v =
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| }}
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| {{Starbox detail
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| | mass =
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| | radius = 53<ref name=lang2006/>
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| | luminosity =
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| | temperature =
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| | metal_fe =
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| | gravity =
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| | rotational_velocity =
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| | age_myr =
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| }}
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| {{Starbox catalog
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| | names = Tau Aquarii, 71 Aquarii, [[Durchmusterung|BD]]–14 6354, [[FK5]] 861, [[Henry Draper Catalogue|HD]] 216032, [[Hipparcos catalogue|HIP]] 112716, [[Bright Star Catalogue|HR]] 8679, [[New Catalogue of Suspected Variable Stars|NSV]] 14329, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 165321.<ref name=SIMBAD/>
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| }}
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| {{Starbox end}}
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| '''Tau<sup>2</sup> Aquarii''' (τ<sup>2</sup> Aqr, τ<sup>2</sup> Aquarii) is the [[Bayer designation]] for a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Aquarius (constellation)|Aquarius]]. It is visible to the naked eye with an [[apparent visual magnitude]] of +4.0.<ref name=sps1966/> This is an orange-hued<ref name=csiro/> [[giant star]] with a [[stellar classification]] of K5 III.<ref name=houk1978/> The measured [[angular diameter]], after correction for [[limb darkening]], is {{nowrap|5.12 ± 0.05 [[milliarcsecond|mas]]}}.<ref name=aaa431_773/> At an estimated distance of {{Convert|318|ly|pc|abbr=off|lk=on}} based on [[parallax]] measurements,<ref name=aaa474_2_653/> this yields a physical size of about 53 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/>
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| ==References==
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| {{reflist|refs=
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| <ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 }}</ref> | |
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| <ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | year=1978 | bibcode=1988mcts.book.....H | postscript=. }}</ref>
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| <ref name=scfs>{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | bibcode=1999VeARI..35....1W | postscript=. }}</ref>
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| <ref name=sps1966>{{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | year=1966 | bibcode=1966PDAUC...1....1G | postscript=. }}</ref>
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| <ref name=aaa431_773>{{citation | last1=Richichi | pages=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}</ref>
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| <ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | year=2006 | isbn=3-540-29692-1 | url=http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
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| :<math>\begin{align} 2\cdot R_*
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| & = \frac{(97\cdot 5.12\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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| & \approx 107\cdot R_{\bigodot}
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| \end{align}</math></ref>
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| <ref name=SIMBAD>{{citation | title=tau Aqr -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+216032 | accessdate=2012-02-08 }}</ref>
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| <ref name=csiro>{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 }}</ref>
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| }}
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| ==External links==
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| * [http://aladin.u-strasbg.fr/AladinPreview?-c=22+49+35.5023-13+35+33.475&ident=*+tau+Aqr&submit=Aladin+previewer Image τ<sup>2</sup> Aquarii]
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| {{Stars of Aquarius}}
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| {{DEFAULTSORT:Tau2 Aquarii}}
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| [[Category:Henry Draper Catalogue objects]]
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| [[Category:Bayer objects|Aquarii, Tau2]]
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| [[Category:Flamsteed objects|Aquarii, 71]]
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| [[Category:Aquarius (constellation)]]
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| [[Category:M-type giants]]
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Alyson is what my husband loves to call me but I don't like when people use my full title. One of the things she enjoys most is canoeing and she's been doing it for fairly a while. For years he's been living in Mississippi and he doesn't plan on altering it. Office supervising is what she does for a living.
Also visit my website; spirit messages (Link Website)