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| name=τ2 Aquarii
}}{{Starbox image
| image={{Location mark
|image=Aquarius constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=τ2 Aqr
|x=358|y=550
}}
|caption=Location of τ2 Aquarii (circled)
}}{{Starbox observe
| epoch = J2000
| ra = {{RA|22|49|35.50157}}[1]
| dec = {{DEC|–13|35|33.4767}}[1]
| appmag_v = +4.042[3]
| constell = Aquarius
}}{{Starbox character
| class = K5 III[4]
| b-v = +1.566[3]
| u-b = +1.948[3]
| variable =
}}{{Starbox astrometry
| radial_v = +1.0[7]
| prop_mo_ra = –13.71[1]
| prop_mo_dec = –39.03[1]
| parallax = 10.27
| p_error = 0.29
| parallax_footnote = [1]
| absmag_v = −1.28
}}{{Starbox detail
| mass =
| radius = 53[12]
| luminosity =
| temperature =
| metal_fe =
| gravity =
| rotational_velocity =
| age_myr =
}}{{Starbox catalog
| names = τ2 Aquarii, 71 Aquarii, BD–14° 6354, FK5 861, HD 216032, HIP 112716, HR 8679, NSV 14329, SAO 165321.[13]
}}{{Starbox reference
|Simbad=tau02+Aqr
}}{{Starbox end}}Tau2 Aquarii (τ2 Aqr, τ2 Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +4.0.[3] Because the star lies near the ecliptic it is subject to occultations by the Moon.[15]
This is an orange-hued[16] giant star with a stellar classification of K5 III.[4] The measured angular diameter, after correction for limb darkening, is {{nowrap|5.12 ± 0.05 mas}}.[18] At an estimated distance of {{Convert|318|ly|pc|abbr=off|lk=on}} based on parallax measurements,[1] this yields a physical size of about 53 times the radius of the Sun.[12]
References
1. ^1 {{citation | title=A Catalog of Stellar Angular Diameters Measured by Lunar Occultation | last1=White | first1=Nathaniel M. | last2=Feierman | first2=Barry H. | journal=Astronomical Journal | postscript=. | volume=94 | page=751 | date=September 1987 | doi=10.1086/114513 | bibcode=1987AJ.....94..751W }}
2. ^1 2 3 4 5 6 {{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 }}
3. ^1 2 {{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | journal=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4 | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | date=1978 | bibcode=1988mcts.book.....H | postscript=. }}
4. ^1 {{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | journal=Veröff. Astron. Rechen-Inst. Heidelb | volume=35 | 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=. }}
5. ^1 2 3 4 {{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 | journal=Publ. Dept. Astron. Univ. Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | date=1966 | bibcode=1966PDAUC...1....1G | 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 | issue=2 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
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 }}. The radius (R*) is given by::
8. ^1 {{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 }}
9. ^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 }}
[1][2][3][4][5][6][7][8][9]2. ^1 2 3 4 5 6 {{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 }}
3. ^1 2 {{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | journal=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4 | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | date=1978 | bibcode=1988mcts.book.....H | postscript=. }}
4. ^1 {{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | journal=Veröff. Astron. Rechen-Inst. Heidelb | volume=35 | 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=. }}
5. ^1 2 3 4 {{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 | journal=Publ. Dept. Astron. Univ. Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | date=1966 | bibcode=1966PDAUC...1....1G | 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 | issue=2 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
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 }}. The radius (R*) is given by::
8. ^1 {{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 }}
9. ^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 }}
}}
External links
- Image τ2 Aquarii
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