Psi Scorpii

ψ Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 12m 00.01043s[1]
Declination −10° 03′ 50.8353″[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Spectral type A1 V[3]
U−B color index +0.11[2]
B−V color index +0.09[2]
Astrometry
Radial velocity (Rv)−5.10[4] km/s
Proper motion (μ) RA: −18.000[1] mas/yr
Dec.: −36.188[1] mas/yr
Parallax (π)20.1801 ± 0.2617 mas[1]
Distance162 ± 2 ly
(49.6 ± 0.6 pc)
Absolute magnitude (MV)+1.55[5]
Details
Mass2.0[6] M☉
Radius2.2[7] R☉
Luminosity18.6[8] L☉
Surface gravity (log g)4.00[6] cgs
Temperature8,846±301[6] K
Rotational velocity (v sin i)42.3±0.6[9] km/s
Age451[6] Myr
Other designations
ψ Sco, 15 Scorpii, BD−09°4324, FK5 3280, GC 21780, HD 145570, HIP 79375, HR 6031, SAO 141022[10]
Database references
SIMBADdata

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,[2] which is bright enough to be faintly visible to the naked eye. Based upon parallax measurements,[1] 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.[11][12] The system is drifting closer to the Sun with a radial velocity of −5 km/s.[4]

The visible component is an A-type main sequence star with a stellar classification of A1 V;[3] a class of star that is still fusing hydrogen at its core. It has around twice[6] the mass and 2.2[7] times the radius of the Sun, and is shining with 18.6 times the Sun's luminosity.[8] 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.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference bsc was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Michigan was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Diaz2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Frankowski2007 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).