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| {{Starbox begin
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| | name = Tau Aquilae
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| }}
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| {{Starbox image
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| | image =
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| <div style="position: relative">[[File:Aquila IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Aquila constellation and its surroundings]]
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| <div style="position: absolute; left: 36.8%; top: 33.8%;">[[File:Cercle rouge 100%.svg|12px]]</div>
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| </div>
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| | caption = Location of τ Aquilae (circled)
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| }}
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| {{Starbox observe
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| | epoch = [[J2000.0]]
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| | constell = [[Aquila (constellation)|Aquila]]
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| | ra = {{RA|20|04|08.31550}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|+07|16|40.6683}}<ref name=aaa474_2_653/>
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| | appmag_v = {{nowrap|5.6799 ± 0.0009}}<ref name=aaa430_165/>
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| }}
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| {{Starbox character
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| | class = K0 III<ref name=apjss74/>
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| | r-i =
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| | v-r =
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| | b-v = +1.06<ref name=clpl4_99/>
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| | u-b = +0.86<ref name=clpl4_99/>
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| | variable =
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| }}
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| {{Starbox astrometry
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| | radial_v = {{nowrap|–29.52 ± 0.23}}<ref name=aaa430_165/>
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| | prop_mo_ra = +14.74<ref name=aaa474_2_653/>
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| | prop_mo_dec = +12.10<ref name=aaa474_2_653/>
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| | parallax = 7.06
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| | p_error = 0.41
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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 = 16.5<ref name=lang2006/>
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| | metal_fe = –0.15<ref name=apjss74/>
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| | gravity = 2.69<ref name=apjss74/>
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| | luminosity =
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| | temperature = 4,660<ref name=apjss74/>
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| | rotational_velocity =
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| | age_gyr =
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| }}
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| {{Starbox catalog
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| | names = 63 Aquilae, [[Bonner Durchmusterung|BD]]+06 4416, [[Fifth Fundamental Catalogue|FK5]] 1524, [[Henry Draper Catalogue|HD]] 190327, [[Harvard Revised catalogue|HR]] 7669,[[Hipparcos catalogue|HIP]] 98823, [[Smithsonian Astrophysical Observatory catalogue|SAO]] 125403.<ref name=SIMBAD/>
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| }}
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| {{Starbox end}}
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| '''Tau Aquilae''' (τ Aql, τ Aquilae) is the [[Bayer designation]] for a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Aquila (constellation)|Aquila]]. The [[apparent visual magnitude]] of 5.7<ref name=aaa430_165/> indicates it is a faint star that is visible to the naked eye from suburban skies; at least according to the [[Bortle Dark-Sky Scale]]. The annual orbital motion of the Earth causes a [[parallax]] shift of 7.06 [[milliarcsecond|mas]],<ref name=aaa474_2_653/> which means the distance to this star is approximately {{Convert|460|ly|pc|abbr=off}}. The magnitude of the star is diminished by 0.28 from [[extinction (astronomy)|extinction]] caused by interstellar gas and dust.<ref name=aaa430_165/> | |
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| The [[spectrum]] of Tau Aquilae matches a [[stellar classification]] of K0 III,<ref name=apjss74/> with the [[luminosity class]] of III suggesting this is an [[stellar evolution|evolved]] [[giant star]] that has exhausted the supply of hydrogen at its core and left the [[main sequence]] of stars like the Sun. The measured [[angular diameter]] of this star is {{nowrap|1.08 ± 0.01 [[milliarcsecond|mas]]}}.<ref name=aaa431_773/> At the estimated distance of this system, this yields a physical size of about 16.5 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> The [[stellar atmosphere|outer envelope]] is radiating energy into space with an [[effective temperature]] of 4,660 K,<ref name=apjss74/> giving it the orange hued glow of a [[K-type star]].<ref name=csiro/>
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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=apjss74>{{citation | last1=McWilliam | first1=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. }}</ref>
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| <ref name=aaa430_165>{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}</ref> | |
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| <ref name=clpl4_99>{{citation | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref>
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| <ref name=SIMBAD>{{citation | title=tau Aql -- Star | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Tau+Aquilae | accessdate=2012-07-21 | postscript=. }}</ref>
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| <ref name=aaa431_773>{{citation | last1=Richichi | first1=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{(142\cdot 1.08\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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| & \approx 33\cdot R_{\bigodot}
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| \end{align}</math></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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| ==External links==
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| * [http://aladin.u-strasbg.fr/AladinPreview?-c=20+04+08.3152%2B07+16+40.677&ident=*+tau+Aql&submit=Aladin+previewer Image Tau Aquilae]
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| {{Stars of Aquila}}
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| [[Category:Henry Draper Catalogue objects]]
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| [[Category:Bayer objects|Aquilae, Tau]]
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| [[Category:Aquila (constellation)]]
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| [[Category:K-type giants]]
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