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Hi Joe
Theta Scorpius is not listed in the Cambridge Double Star Atlas though it is marked as a binary on the maps. Also is not listed in the Night Sky Observers Guide, vol2.
It is marked and listed in Stellarium with the same details that you mention, so that and Sky Safari may get their info from the same source. Haven't checked with the Washington Double Star Catalogue yet, which is the definitive source for double ( multiple ) star information. You may want to search through their archives for any recent measures for Theta .
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