- References
| name = 98 Aquarii
}}{{Starbox image
| image =
| caption = Location of 98 Aquarii (circled)
}}{{Starbox observe
| epoch = J2000
| ra = {{RA|23|22|58.22606}}
| dec = {{DEC|–20|06|02.0963}}
| appmag_v = +3.97[3]
| constell = Aquarius
}}{{Starbox character
| class = K0 III[4]
| b-v = +1.089[3]
| u-b = +0.948[3]
| variable =
}}{{Starbox astrometry
| radial_v = –6.5[7]
| prop_mo_ra = –121.28
| prop_mo_dec = –97.59
| parallax = 19.96
| p_error = 0.23
| parallax_footnote =
| absmag_v =
}}{{Starbox detail
| mass = 2.1[11]
| radius = 14[12]
| luminosity =
| gravity = 2.4[11]
| temperature = 4,630[11]
| metal_fe = –0.30[11]
| rotational_velocity =
| age_gyr =
}}{{Starbox catalog
| names= BD–20 6587, FK5 1612, HD 220321, HIP 115438, HR 8892, SAO 191858.[16]
}}{{Starbox reference
|Simbad=98+Aqr
}}{{Starbox end}}98 Aquarii (abbreviated 98 Aqr) is a star in the equatorial constellation of Aquarius. 98 Aquarii is the Flamsteed designation, although it also bears the Bayer designation b1 Aquarii. It is visible to the naked eye with an apparent visual magnitude of +3.97.[3] The distance to this star, {{Convert|163|ly|pc|abbr=off|lk=on}}, is known from parallax measurements made with the Hipparcos spacecraft.
With over double the mass of the Sun,[11] this is an evolved giant star that has a stellar classification of K0 III.[4] The measured angular diameter of this star is {{nowrap|2.54 ± 0.13 mas}}.[21] At the estimated distance of 98 Aquarii, this yields a physical size of about 14 times the radius of the Sun.[12] The expanded outer envelope has an effective temperature of 4,630 K,[11] giving it the orange glow of a K-type star.[25]
References
1. ^1 2 3 4 5 6 {{citation | display-authors=1 | last1=Melo | first1=C. H. F. | last2=de Laverny | first2=P. | last3=Santos | first3=N. C. | last4=Israelian | first4=G. | last5=Randich | first5=S. | last6=Do Nascimento | first6=J. D., Jr. | last7=de Medeiros | first7=J. R. | title=On the nature of lithium-rich giant stars. Constraints from beryllium abundances | journal=Astronomy and Astrophysics | volume=439 | issue=1 | pages=227–235 |date=August 2005 | doi=10.1051/0004-6361:20041805 | bibcode=2005A&A...439..227M | arxiv=astro-ph/0504133 | postscript=. }}
2. ^1 2 {{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=. }}
3. ^1 {{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=. }}
4. ^1 2 3 4 {{citation | last1=Jennens | first1=P. A. | last2=Helfer | first2=H. L. | title=A new photometric metal abundance and luminosity calibration for field G and K giants. | journal=Monthly Notices of the Royal Astronomical Society | volume=172 | pages=667–679 |date=September 1975 | bibcode=1975MNRAS.172..667J | postscript=. | doi=10.1093/mnras/172.3.667}}
5. ^1 {{cite simbad | title=* 98 Aqr| accessdate=2006-11-05 | postscript=. }}
6. ^1 {{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 | postscript=. }}
7. ^1 2 {{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 | postscript=. }}. The radius (R*) is given by::
8. ^1 {{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 |postscript=. |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=March 10, 2012 }}
[1][2][3][4][5][6][7][8]2. ^1 2 {{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=. }}
3. ^1 {{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=. }}
4. ^1 2 3 4 {{citation | last1=Jennens | first1=P. A. | last2=Helfer | first2=H. L. | title=A new photometric metal abundance and luminosity calibration for field G and K giants. | journal=Monthly Notices of the Royal Astronomical Society | volume=172 | pages=667–679 |date=September 1975 | bibcode=1975MNRAS.172..667J | postscript=. | doi=10.1093/mnras/172.3.667}}
5. ^1 {{cite simbad | title=* 98 Aqr| accessdate=2006-11-05 | postscript=. }}
6. ^1 {{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 | postscript=. }}
7. ^1 2 {{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 | postscript=. }}. The radius (R*) is given by::
8. ^1 {{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 |postscript=. |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=March 10, 2012 }}
}}{{Stars of Aquarius}}
8 : Bayer objects|Flamsteed objects|Aquarius (constellation)|K-type giants|Hipparcos objects|HR objects|Henry Draper Catalogue objects|Durchmusterung objects
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