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| {{Starbox begin
| | Alyson is what my husband enjoys to contact me but I don't like when people use my complete title. Her family life in Ohio. To climb is something I truly appreciate performing. Office supervising is my occupation.<br><br>Check out my web blog; psychic chat online ([http://www.chk.woobi.co.kr/xe/?document_srl=346069 look at this site]) |
| | name = 3 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: 74.2%; top: 37.2%">[[File:Cercle rouge 100%.svg|12px]]</div>
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| </div>
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| | caption = Location of 3 Aquarii (circled)
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| }}
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| {{Starbox observe
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| | epoch = J2000
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| | ra = {{RA|20|47|44.23898}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|–05|01|39.7220}}<ref name=aaa474_2_653/>
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| | appmag_v = 4.429<ref name=sps1966/>
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| | constell = [[Andromeda (constellation)|Andromeda]]
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| }}
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| {{Starbox character
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| | class = M3 III<ref name=araa11_29/>
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| | b-v = +1.651<ref name=sps1966/>
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| | u-b = +1.914<ref name=sps1966/>
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| | variable = [[Semiregular variable|Semiregular]]
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| }}
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| {{Starbox astrometry
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| | radial_v = –22.0<ref name=scfs/>
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| | prop_mo_ra = +1.68<ref name=aaa474_2_653/>
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| | prop_mo_dec = –40.06<ref name=aaa474_2_653/>
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| | parallax = 5.57
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| | p_error = 0.28
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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 = 108<ref name=lang2006/>
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| | luminosity =
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| | temperature = 3,933<ref name=aaa515_A11/>
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| | metal_fe =
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| | gravity =
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| | rotation_velocity =
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| | age_gyr =
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| }}
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| {{Starbox catalog
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| | names = EN Aqr, 3 Aqr, k Aqr, [[Bonner Durchmusterung|BD]]–05 5378, [[FK5]] 1543, [[Henry Draper Catalogue|HD]] 198026, [[Hipparcos catalogue|HIP]] 102624, [[Bright Star Catalogue|HR]] 7951, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 144814.<ref name=SIMBAD/>
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| }}
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| {{Starbox end}}
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| '''3 Aquarii''' is the [[Flamsteed designation]] for a [[variable star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Aquarius (constellation)|Aquarius]]. It has the [[Bayer designation]] ''k Aquarii'' and the variable star designation ''EN Aquarii''. With a mean [[apparent visual magnitude]] of 4.429,<ref name=sps1966/> it is visible to the naked eye in dark skies. It has an annual [[parallax]] shift of 5.57 [[milliarcsecond]]s with a 5% [[margin of error]],<ref name=aaa474_2_653/> which translates to a physical distance of around {{Convert|590|ly|pc|abbr=off|lk=on}} from Earth.
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| {| class="wikitable" style="float: left; text-align: center;"
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| |+ Pulsation periods<ref name=mnras400_4_1945/>
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| ! Period<br><span style="font-size: smaller;">(days)</span>
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| ! Amplitude<br><span style="font-size: smaller;">(Magnitude)</span>
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| |-
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| | 20.2 || 0.020
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| |-
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| | 24.9 || 0.038
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| |-
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| | 27.2 || 0.027
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| |-
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| | 35.0 || 0.021
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| |-
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| | 36.9 || 0.024
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| |-
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| | 143.9 || 0.022
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| |-
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| | 197.2 || 0.027
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| |}
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| With a [[stellar classification]] of M3 III,<ref name=araa11_29/> this is a [[red giant]] star that has exhausted the hydrogen at its core and [[stellar evolution|evolved]] away from the [[main sequence]] of stars like the Sun. The luminosity of this star varies over time, following multiple periods of variability.<ref name=mnras400_4_1945/> The measured [[angular diameter]] of this star, after correction for [[limb darkening]], is {{nowrap|5.60 ± 0.70 [[milliarcsecond|mas]]}}.<ref name=aaa431_773/> At the estimated distance of 3 Aquarii,<ref name=aaa474_2_653/> this yields a physical size of about 108 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> The [[effective temperature]] of the [[stellar atmosphere|outer atmosphere]] is 3,933 K,<ref name=aaa515_A11/> giving this star the cool reddish hue of an [[M-type star]].
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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=araa11_29>{{cite journal | last1=Morgan | first1=W. W. | last2=Keenan | first2=P. C. | title=Spectral Classification | journal=Annual Review of Astronomy and Astrophysics | volume=11 | page=29 | year=1973 | doi=10.1146/annurev.aa.11.090173.000333 | bibcode=1973ARA&A..11...29M | postscript=. }}</ref>
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| <ref name=sps1966>{{cite journal | 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=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=aaa515_A11>{{citation | display-authors=1 | last1=Soubiran | first1=C. | last1=Le Campion | first1=J.-F. | last1=Cayrel de Strobel | first1=G. | last1=Caillo | first1=A. | title=The PASTEL catalogue of stellar parameters | journal=Astronomy and Astrophysics | volume=515 | page=A111 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. |arxiv = 1004.1069 |date=June 2010}}</ref>
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| <ref name=mnras400_4_1945>{{citation | display-authors=1 | last1=Tabur | first1=V. | last2=Bedding | first2=T. R. | last3=Kiss | first3=L. L. | last4=Moon | first4=T. T. | last5=Szeidl | first5=B. | last6=Kjeldsen | first6=H. | title=Long-term photometry and periods for 261 nearby pulsating M giants | journal=Monthly Notices of the Royal Astronomical Society | volume=400 | issue=4 | pages=1945–1961 | doi=10.1111/j.1365-2966.2009.15588.x | bibcode=2009MNRAS.400.1945T | postscript=. |arxiv = 0908.3228 |date=December 2009}}</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 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | postscript=. |date=February 2005}}</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 | postscript=. }}. The radius (R<sub>*</sub>) is given by:
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| :<math>\begin{align} 2\cdot R_*
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| & = \frac{(180\cdot 5.60\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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| & \approx 216.8\cdot R_{\bigodot}
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| \end{align}</math></ref>
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| <ref name=SIMBAD>{{citation | title=EN Aqr -- Pulsating variable Star | work=SIMBAD Astronomical Object Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=3+Aquarii | accessdate=2012-07-16 }}</ref>
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| }}
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| ==External links==
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| * [http://aladin.u-strasbg.fr/AladinPreview?-c=20+47+44.2360-05+01+39.723&ident=V*+EN+Aqr&submit=Aladin+previewer Image 3 Aquarii]
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| {{Stars of Aquarius}}
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| [[Category:Bayer objects|Aquarii, k]]
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| [[Category:Flamsteed objects|Aquarii, 3]]
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| [[Category:Objects named with variable star designations|Aquarii, EN]]
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| [[Category:Henry Draper Catalogue objects|198026]]
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| [[Category:Aquarius (constellation)]]
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| [[Category:Variable stars]]
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