There have been reports that Delta Scorpii A is itself a very close spectroscopic binary, but this does not appear to be the case. δ Scorpii is a proper motion member of the Upper Scorpius subgroup of the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. The Upper Scorpius subgroup contains thousands of young stars with mean age 11 million years at average distance of 470 light years (145 parsecs). References External links Jim Kaler's Stars, University of Illinois: Dschubba Delta Scorpii brighter than ever (Sky and Telescope, February 4, 2002) Delta Scorpii still showing off (Sky and Telescope, June 25, 2003) Delta Scorpii: the birth of a Be star (AAVSO article) Scorpius (constellation) Scorpii, Delta B-type subgiants Dschubba Upper Scorpius B-type main-sequence stars Binary stars Gamma Cassiopeiae variable stars Be stars BD-22 4068 5953 078401 143275 Scorpii, 07