Epoch J2000.0 Equinox J2000.0
|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 + ?
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.
Xi Scorpii was a latter designation of 51 Librae.
- Xi Scorpii on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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