Theta Scorpii
Theta Scorpii (θ Scorpii, abbreviated Theta Sco, θ Sco) is a binary star in the southern zodiac constellation of Scorpius. The apparent visual magnitude of this star is +1.87, making it readily visible to the naked eye and one of the brightest stars in the night sky. It is sufficiently near that the distance can be measured directly using the parallax technique and such measurements obtained during the Hipparcos mission yield an estimate of approximately 329 light-years (101 parsecs) from the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 37m 19.12985s |
| Declination | −42° 59′ 52.1808″ |
| Apparent magnitude (V) | 1.84 (1.862 + 6.22) |
| Characteristics | |
| Spectral type | F0 II |
| U−B color index | +0.21 |
| B−V color index | +0.40 |
| Astrometry | |
| Radial velocity (Rv) | +1.4 km/s |
| Proper motion (μ) | RA: +5.54 mas/yr Dec.: −3.12 mas/yr |
| Parallax (π) | 9.90 ± 0.26 mas |
| Distance | 329 ± 9 ly (101 ± 3 pc) |
| Absolute magnitude (MV) | −2.71 |
| Details | |
| Mass | 3.10+0.37 −0.32 M☉ |
| Radius | 26.3 - 35.5 R☉ |
| Luminosity | 1,400 L☉ |
| Surface gravity (log g) | 2.4±0.2 cgs |
| Temperature | 6,294 K |
| Rotation | 16.60 d |
| Rotational velocity (v sin i) | 125 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The two components are designated θ Scorpii A (officially named Sargas /ˈsɑːrɡæs/, the traditional name for the system) and B.
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