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{{Starbox begin
| name = α Sextantis
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Sextans
| ra = {{RA|10|07|56.29556}}
| dec = {{DEC|−0|22|17.8621}}
| appmag_v = 4.49[3]
}}{{Starbox character
| class = A0 III[4]
| b-v = −0.04[3]
| u-b = −0.07[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = 10.00[7]
| prop_mo_ra = −25.83
| prop_mo_dec = −4.25
| parallax = 11.51
| p_error = 0.98
| parallax_footnote =
| absmag_v = {{Val|−0.29|0.21}}[11]
}}{{Starbox detail
| mass = {{val|2.96|0.12}}[11]
| radius = 4.5[13]
| luminosity = 120[14]
| temperature = 9,984[14]
| gravity = 3.55[16]
| metal_fe = {{Val|−0.03|0.18}}[16]
| rotational_velocity = 21[18]
| rotation =
| age_myr = 295[19]
}}{{Starbox catalog
| names = α Sex, 15 Sextantis, BD+00° 2615, FK5 2814, HD 87887, HIP 49641, HR 3981, SAO 137366.[20]
}}{{Starbox reference
|Simbad=alf+Sex
}}{{starbox end}}Alpha Sextantis (α Sex, α Sextantis) is the brightest star in the equatorial constellation of Sextans.[21] It is visible to the naked eye on a dark night with an apparent visual magnitude of 4.49.[3] The distance to this star, as determined from parallax measurements,[ is around 280 light years. This is considered an informal "equator star", as it lies less than a quarter of a degree south of the celestial equator. In 1900, it was 7 minutes of arc north of the equator. As a result of a shift in the Earth's axial tilt, it crossed over to the Southern Hemisphere in December 1923.[24]]This is an evolved A-type giant star with a stellar classification of A0 III.[4] It has around three[11] times the mass of the Sun and 4.5[13] times the Sun's radius. The abundance of elements is similar to that in the Sun.[16] It radiates 120 times the solar luminosity from its outer atmosphere at an effective temperature of 9,984 K.[14] Alpha Sextantis is around 295[19] million years old with a projected rotational velocity of 21 km/s.[18] References1. ^1 {{Cite journal | title=Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | last1=Gontcharov | first1=G. A. | journal=Astronomy Letters | postscript=. | volume=32| issue=11| pages=759–771| date=November 2006 | doi=10.1134/S1063773706110065| bibcode=2006AstL...32..759G |arxiv = 1606.08053 }}
2. ^1 2 3 {{citation | title=Search for reference A0 dwarf stars: Masses and luminosities revisited with HIPPARCOS parallaxes | last1=Gerbaldi, M. | last2=Faraggiana, R. | last3=Burnage, R. | last4=Delmas, F. | last5=Gómez, A. E. | last6=Grenier, S. | journal=Astronomy and Astrophysics Supplement | display-authors=1 | volume=137 | pages=273–292 | date=June 1999 | doi=10.1051/aas:1999248 | bibcode=1999A&AS..137..273G | postscript=. }}
3. ^1 2 {{citation | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) | edition=Third | journal=Astronomy and Astrophysics | display-authors=1 | volume=367 | pages=521–524 | date=February 2001 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | postscript=. }}
4. ^1 2 3 {{citation | title=Elemental abundance analyses with the EBASIM spectrograph of the 2.1-m CASLEO Observatory Telescope. I. The late B and early A stars vec xi Octantis, alpha Sextantis, and 68 Tauri | last1=Pintado | first1=O. I. | last2=Adelman | first2=S. J. | journal=Astronomy and Astrophysics | volume=406 | pages=987–994 | date=August 2003 | doi=10.1051/0004-6361:20030813 | bibcode=2003A&A...406..987P | postscript=. }}
5. ^1 2 {{citation | title=Debris Disk Evolution around A Stars | display-authors=1 | last1=Su | first1=K. Y. L. | last2=Rieke | first2=G. H. | last3=Stansberry | first3=J. A. | last4=Bryden | first4=G. | last5=Stapelfeldt | first5=K. R. | last6=Trilling | first6=D. E. | last7=Muzerolle | first7=J. | last8=Beichman | first8=C. A. | last9=Moro-Martin | first9=A. | last10=Hines | first10=D. C. | last11=Werner | first11=M. W. | journal=The Astrophysical Journal | volume=653 | issue=1 | pages=675–689 | date=December 2006 | doi=10.1086/508649 | bibcode=2006ApJ...653..675S | arxiv=astro-ph/0608563 | postscript=. }}
6. ^1 2 {{citation | last1=Cowley | first1=A. | last2=Cowley | first2=C. | last3=Jaschek | first3=M. | last4=Jaschek | first4=C. | title=A study of the bright A stars. I. A catalogue of spectral classifications | journal=Astronomical Journal | display-authors=1 | volume=74 | pages=375–406 | date=April 1969 | doi=10.1086/110819 | bibcode=1969AJ.....74..375C | postscript=. }}
7. ^1 2 3 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
8. ^1 2 {{citation | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 | date=October 2002 | doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255 | postscript=. }}
9. ^1 {{citation | title=Sextans (abbr. Sex, gen. Sextantis) | url=http://www.daviddarling.info/encyclopedia/S/Sex.html | work=The Internet Encyclopedia of Science | accessdate=2016-12-12 | postscript=. }}
10. ^1 {{citation | first1=James B. | last1=Kaler | title=Alpha Sextantis | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/alphasext.html | accessdate=2016-12-12 | postscript=. }}
11. ^1 2 3 4 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | publisher=SIMBAD | postscript=. | date=1986 | bibcode=1986EgUBV........0M }}
12. ^1 {{cite simbad | title=alf Sex | accessdate=2016-12-12 | postscript=. }}
[1][2][3][4][5][6][7][8][9][10][11][12]
}}External links- [https://web.archive.org/web/20060705214728/http://www.site.uottawa.ca:4321/astronomy/index.html#AlphaSextantis Astronomy Knowledge Database]
{{Stars of Sextans|state=collapsed}} 8 : A-type giants|Sextans (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |