Xi Scorpii

Starbox short
name=ξ Scorpii
epoch=J2000.0
constell=Scorpius
ra=16^h 04^m 22.1^s
dec=−11° 22' 23"
spectral=ABC: F5IV + F8V + ?
DEF: K0 + K0 + ?
appmag_v="combined": +4.16
ABC: 4.8 + 5.1 + 7.6
DEF: 7.4 + 8.1 + 11
dist_ly=92.5 ± 6.7
dist_pc=28.4 ± 2.1
names=Grafias, ξ Sco, HR 5977 + HR 5978, HD 144069 + HD 144070 + HD 144087 + HD 144088, SAO 159665, HIP 78727 + HIP 78738 + HIP 78739, ADS 9909 + ADS 9910, CCDM J16044-1123

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 gravitationallybound to the other five components.

External links

*WikiSky