Pi Scorpii
Pi Scorpii or π Scorpii, is a triple star system in the southern constellation of Scorpius. With a combined apparent magnitude of 2.9, it can be easily seen with the naked eye. Parallax measurements yield an estimated distance of around 590 light-years (180 parsecs) from the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 15h 58m 51.11324s |
| Declination | −26° 06′ 50.7886″ |
| Apparent magnitude (V) | 2.890 |
| Characteristics | |
| Spectral type | B1 V + B2 V |
| U−B color index | −0.918 |
| B−V color index | −0.187 |
| Variable type | Eclipsing binary |
| Astrometry | |
| Radial velocity (Rv) | −3 km/s |
| Proper motion (μ) | RA: −11.42 mas/yr Dec.: −26.83 mas/yr |
| Parallax (π) | 5.57 ± 0.64 mas |
| Distance | approx. 590 ly (approx. 180 pc) |
| Absolute magnitude (MV) | −3.35 |
| Orbit | |
| Period (P) | 1.570103±0.000005 d |
| Semi-major axis (a) | ~0.07 AU |
| Eccentricity (e) | 0.0 |
| Inclination (i) | ~42° |
| Semi-amplitude (K1) (primary) | 124.1±1.5 km/s |
| Semi-amplitude (K2) (secondary) | 196.1±1.8 km/s |
| Details | |
| π Sco A | |
| Mass | 12.5±0.6 M☉ |
| Radius | 5 R☉ |
| Luminosity | 21,900 L☉ |
| Temperature | 25,230 K |
| Rotation | 100 |
| Rotational velocity (v sin i) | 108 km/s |
| Age | 15.4±0.6 12–14 Myr |
| π Sco B | |
| Mass | 9 M☉ |
| Radius | 4 R☉ |
| Luminosity | 3000 L☉ |
| Temperature | 21000 K |
| Rotational velocity (v sin i) | 87 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
It consists of a binary pair, designated Pi Scorpii A, with a more distant third companion, B. A's two components are themselves designated Pi Scorpii Aa (formally named Fang) and Ab.
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