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] |
Distance | 162 ± 2 ly (49.6 ± 0.6 pc) |
Absolute magnitude (MV) | +1.55[5] |
Details | |
Mass | 2.0[6] M☉ |
Radius | 2.2[7] R☉ |
Luminosity | 18.6[8] L☉ |
Surface gravity (log g) | 4.00[6] cgs |
Temperature | 8,846±301[6] K |
Rotational velocity (v sin i) | 42.3±0.6[9] km/s |
Age | 451[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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