Pi Scorpii

Pi Scorpii
Location of π Scorpii (circled)
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
Distanceapprox. 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
Mass12.5±0.6 M
Radius5 R
Luminosity21,900 L
Temperature25,230 K
Rotation100
Rotational velocity (v sin i)108 km/s
Age15.4±0.6
12–14 Myr
π Sco B
Mass9 M
Radius4 R
Luminosity3000 L
Temperature21000 K
Rotational velocity (v sin i)87 km/s
Other designations
Fang, Pi Sco, π Sco, 6 Scorpii, CD−25°11228, HD 143018, HIP 78265, HR 5944, SAO 183987, ADS 9862, WDS 15589-2607
Database references
SIMBADdata

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.

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.