Psi Scorpii
{{short description|White-hued star in the constellation Scorpius}}
{{Starbox begin
| name = ψ Scorpii
}}
{{Starbox observe
| epoch = J2000
| constell = Scorpius
| dec = {{DEC|-10|03|50.8353}}
}}
{{Starbox character
}}
{{Starbox astrometry
| parallax = 20.1801
| p_error = 0.2617
}}
{{Starbox detail
| temperature = {{Val|8846|301|fmt=commas}}
| metal_fe =
| rotational_velocity = {{Val|42.3|0.6}}
}}
{{Starbox catalog
| names = {{odlist | B=ψ Sco | F=15 Scorpii | BD=−09°4324 | FK5=3280 | HD=145570 | HIP=79375 | HR=6031 | SAO=141022 | GC=21780 }}
}}
{{Starbox reference
|Simbad=psi+Sco
}}
{{Starbox end}}
Psi Scorpii, which is Latinized from ψ Scorpii, is a star in the zodiac constellation of Scorpius. It is white in hue and has an apparent visual magnitude of 4.94, which is bright enough to be faintly visible to the naked eye. Based upon parallax measurements, it is located at a distance of around 162 light years from the Sun. Data collected during the Hipparcos mission suggests it is an astrometric binary, although nothing is known about the companion. The system is drifting closer to the Sun with a radial velocity of −5 km/s.
The visible component is an A-type main sequence star with a stellar classification of A1 V; a class of star that is still fusing hydrogen at its core. It has around twice the mass and 2.2 times the radius of the Sun, and is shining with 18.6 times the Sun's luminosity. The effective temperature of the star's outer atmosphere is 8,846 K. Psi Scorpii is around 451 million years old and is spinning with a projected rotational velocity of 42.3 km/s.
References
{{reflist|refs=
{{cite DR2|4344947181887184000}}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
| last1=Gontcharov | first1=G. A.
| journal=Astronomy Letters
| volume=32 | issue=11 | pages=759–771 | date=November 2006
| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G
| postscript=. |arxiv = 1606.08053 | s2cid=119231169 }}
| display-authors=1
| last1=Díaz | first1=C. G. | last2=González | first2=J. F.
| last3=Levato | first3=H. | last4=Grosso | first4=M.
| title=Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum
| journal=Astronomy & Astrophysics
| volume=531 | page=A143 |date=July 2011
| doi=10.1051/0004-6361/201016386 | bibcode=2011A&A...531A.143D
| arxiv=1012.4858 | s2cid=119286673 | postscript=. }}
| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.
| journal=The Astrophysical Journal
| volume=804 | issue=2 | pages=146 | year=2015
| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146
| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}
| display-authors=1 | last1=Frankowski | first1=A.
| last2=Jancart | first2=S. | last3=Jorissen | first3=A.
| title=Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data
| journal=Astronomy and Astrophysics
| volume=464 | issue=1 | pages=377–392 |date=March 2007
| doi=10.1051/0004-6361:20065526 | bibcode=2007A&A...464..377F
| arxiv=astro-ph/0612449 | s2cid=14010423 | postscript=. }}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| 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 | doi-access=free | s2cid=118665352 | postscript=. }}
| display-authors=1 | 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) - Third edition - Comments and statistics
| journal=Astronomy & Astrophysics
| volume=367 | pages=521–24 | date=2001
| issue=2 | bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451
| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}
| title=psi Sco -- Star
| work=SIMBAD Astronomical Database
| publisher=Centre de Données astronomiques de Strasbourg
| url=http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=Psi+Sco
| access-date=2016-09-24 | postscript=. }}
}}
External links
- {{citation
| first1=James B. | last1=Kaler | date=August 12, 2016
| title=Chi and Psi Scorpii | work=Stars | publisher=University of Illinois
| url=http://stars.astro.illinois.edu/Sow/chisco.html
| access-date=2016-09-25 | postscript=. }}
{{Stars of Scorpius|state=collapsed}}
Category:A-type main-sequence stars