Psi Scorpii

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ψ Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 11m 59.98852s[1]
Declination −10° 03′ 51.2683″[1]
Apparent magnitude (V) 4.96[2]
Spectral type A3 IV[2]
B−V color index +0.09[2]
Radial velocity (Rv) −5.10[3] km/s
Proper motion (μ) RA: −21.98[1] mas/yr
Dec.: −23.74[1] mas/yr
Parallax (π) 20.96 ± 1.36[1] mas
Distance 160 ± 10 ly
(48 ± 3 pc)
Mass 2.0[4] M
Radius 2.2[5] R
Luminosity 18.6[6] L
Surface gravity (log g) 4.00[4] cgs
Temperature 8,846±301[4] K
Rotational velocity (v sin i) 42.3±0.6[7] km/s
Age 451[4] Myr
Other designations
15 Scorpii, FK5 3280, GC 21780, HD 145570, HIP 79375, HR 6031, SAO 141022[8]
Database references

Psi Scorpii (ψ Sco, ψ Scorpii) is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of 4.96,[2] which is bright enough to be faintly visible to the naked eye. Based upon parallax measurements,[1] it is around 160 light years from the Sun. Data collected during the Hipparcos mission suggests it is an astrometric binary, although nothing is known about the companion.[9][10]

This is a white-hued A-type subgiant star with a stellar classification of A3 IV.[2] It has around twice[4] the mass and 2.2[5] times the radius of the Sun, and is shining with 18.6 times the Sun's luminosity.[6] 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.[4]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819. 
  3. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065. 
  4. ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, Bibcode:2015ApJ...804..146D, arXiv:1501.03154Freely accessible, doi:10.1088/0004-637X/804/2/146. 
  5. ^ a b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367: 521–24, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289Freely accessible, doi:10.1051/0004-6361:20000451. 
  6. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  7. ^ Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, Bibcode:2011A&A...531A.143D, arXiv:1012.4858Freely accessible, doi:10.1051/0004-6361/201016386. 
  8. ^ "psi Sco -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-24. 
  9. ^ Frankowski, A.; et al. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics, 464 (1): 377–392, Bibcode:2007A&A...464..377F, arXiv:astro-ph/0612449Freely accessible, doi:10.1051/0004-6361:20065526. 
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878Freely accessible. doi:10.1111/j.1365-2966.2008.13596.x. 

External links[edit]

  • Kaler, James B. (August 12, 2016), "Chi and Psi Scorpii", Stars, University of Illinois, retrieved 2016-09-25.