View source for 88 Aquarii

{{short description|Star in the constellation Aquarius}}
{{about|c<sup>2</sup>&nbsp;Aquarii|other star systems with this [[Bayer designation]]|c Aquarii}}
{{Starbox begin
 | name = 88 Aquarii
}}
{{Starbox image
 | image = 
     <div style="position: relative">[[File:Aquarius IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings]]
     <div style="position: absolute; left: 35.5%; top: 56.8%">[[File:Cercle rouge 100%.svg|12px]]</div>
     </div>
 | caption = Location of 88 Aquarii (circled)
}}
{{Starbox observe
 | epoch       = [[J2000.0]]
 | ra          = {{RA|23|09|26.79681}}<ref name=aaa474_2_653/>
 | dec         = {{DEC|–21|10|20.6812}}<ref name=aaa474_2_653/>
 | appmag_v    = +3.679<ref name=sps1966/>
 | constell    = [[Aquarius (constellation)|Aquarius]]
}}
{{Starbox character
 | class       = K1&nbsp;III<ref name=houk1978/>
 | b-v         = +1.215<ref name=sps1966/>
 | u-b         = +1.239<ref name=sps1966/>
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = +21.1<ref name=scfs/>
 | prop_mo_ra  = +55.40<ref name=aaa474_2_653/>
 | prop_mo_dec = +30.49<ref name=aaa474_2_653/>
 | parallax    = 12.05
 | p_error     = 0.22
 | parallax_footnote = <ref name=aaa474_2_653/>
 | absmag_v    = 
}}
{{Starbox detail
 | mass        = 
 | radius      = 29<ref name=lang2006/>
 | luminosity  = 
 | temperature = 4,430<ref name=apjss74/>
 | metal_fe    = –0.24<ref name=apjss74/>
 | gravity     = 2.34<ref name=apjss74/>
 | rotational_velocity = 
 | age_myr     = 
}}
{{Starbox catalog
 | names = [[Bonner Durchmusterung|BD]]-21°6368, [[FK5]]&nbsp;873, [[Henry Draper Catalogue|HD]]&nbsp;218594, [[Hipparcos catalogue|HIP]]&nbsp;114341, [[Bright Star Catalogue|HR]]&nbsp;8812, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;191683.<ref name=SIMBAD/>
}}
{{Starbox reference
|Simbad=88+Aqr
}}
{{Starbox end}}
'''88 Aquarii''' (abbreviated '''88 Aqr''') is a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Aquarius (constellation)|Aquarius]]. ''88 Aquarii'' is the [[Flamsteed designation]], though it also bears the [[Bayer designation]] '''c<sup>2</sup>&nbsp;Aquarii'''. In dark conditions it is visible to the naked eye with an [[apparent visual magnitude]] of +3.68.<ref name=sps1966/> Based upon [[parallax]] measurements, this star is at a distance of around {{Convert|271|ly|pc|abbr=off|lk=on}} from Earth.<ref name=aaa474_2_653/>

The [[stellar spectrum|spectrum]] of 88 Aquarii matches an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification|classification]] of K1&nbsp;III.<ref name=houk1978/> Its measured [[angular diameter]] is {{nowrap|3.24 ± 0.20 [[milliarcsecond|mas]]}},<ref name=aaa431_773/> which, at the estimated distance of Delta Ophiuchi,<ref name=aaa474_2_653/> yields a physical size of about 29 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> The cool, orange hued glow of this star comes from the [[stellar atmosphere|outer atmosphere's]] [[effective temperature]] of 4,430&nbsp;K.<ref name=apjss74/>

==References==
{{reflist|refs=

<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>

<ref name=apjss74>{{citation | last=McWilliam | first=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>

<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 | date=1978 | bibcode=1988mcts.book.....H | postscript=. }}</ref>

<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 | date=1966 | bibcode=1966PDAUC...1....1G | postscript=. }}</ref>

<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 | date=1999 | bibcode=1999VeARI..35....1W | postscript=. }}</ref>

<ref name=SIMBAD>{{cite simbad | title=* 88 Aqr | accessdate=2012-07-13 }}</ref>

<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>

<ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=[[Birkhäuser]] | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
:<math>\begin{align} 2\cdot R_*
 & = \frac{(83\cdot 3.24\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
 & \approx 58\cdot R_{\bigodot}
\end{align}</math></ref>

}}

==External links==
* [http://aladin.u-strasbg.fr/AladinPreview?-c=23+09+26.7971-21+10+20.675&ident=*++88+Aqr&submit=Aladin+previewer Image 88 Aquarii]
* [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=88+Aquarii&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad]

{{Stars of Aquarius}}

[[Category:Bayer objects|Aquarii, c2]]
[[Category:Flamsteed objects|Aquarii, 088]]
[[Category:Henry Draper Catalogue objects|218594]]
[[Category:Aquarius (constellation)]]
[[Category:K-type giants]]
[[Category:Hipparcos objects|114341]]
[[Category:HR objects|8812]]
[[Category:Durchmusterung objects|BD-21 6368]]