Xi Scorpii
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| Observation data Equinox J2000.0 |
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|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 04m 22.1s |
| Declination | −11° 22' 23" |
| Apparent magnitude (V) | combined: +4.16 ABC: 4.8 + 5.1 + 7.6 DEF: 7.4 + 8.1 + 11 |
| Distance | 92.5 ± 6.7 ly (28.4 ± 2.1 pc) |
| Spectral type | ABC: F5IV + F8V + ? DEF: K0 + K0 + ? |
| Other designations | |
Xi Scorpii (ξ Sco/ξ Scorpii) is a star system in the constellation Scorpius. The Xi Scorpii system consists of at least five stars in two groups separated by 4.67 arcminutes (or 0.08°) on the sky, corresponding to a distance of at least 8000 Astronomical Units (AU).
The brighter group contains Xi Scorpii A, B, and C. A and B are both yellow-white F-type stars. A is a slightly brighter and warmer magnitude +4.8 subgiant, while B is a magnitude +5.1 main sequence dwarf. They are separated by 0.76 arcseconds, or at least 21 AU, roughly a Sun–Uranus distance, and orbit around a common centre once every 46 years. The magnitude +7.6 Xi Scorpii C orbits this pair at ten times the distance, having a separation of 7.6 arcseconds.
The second group contains Xi Scorpii D and E. Both D and E are K-type stars, which are separated by 11.5 arcseconds, more than 320 AU.
Xi Scorpii also possesses a sixth component, the 11th magnitude Xi Scorpii F, located 81 arcseconds from D. It is not known to be gravitationally bound to the other five components.
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