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Xi Sco (Grafias) (Multiple Star, in Scorpius)
Observer: John Callender (e-mail: jbc@west.net, web: http://www.west.net/~jbc/)
Instrument: 8-inch Dobsonian reflector Location: Carpinteria, CA, USA
Light pollution: light Transparency: fair Seeing: good
Time: Sat Jul 5 06:50:00 1997 UT Obs. no.: 189
Split at 49x. Orange primary, blue-green secondary. PA estimated at 085. I noted another pretty double, fainter, about 7' south in the same field, two stars of almost equal brightness with PA 100. Checking Burnham's, I learned that this is Struve 1999, which is recognized as being physically associated with the Xi Scorpii system. There seemed to be a color contrast between the two stars of Struve 1999 at 49x, though I first thought it paralleled that of Xi Scorpii (orangeish primary, bluish secondary), then thought it had switched to the other way around as I was looking at it. At 122x I couldn't say for sure that I saw *any* color contrast.
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Questions? Problems? E-mail jbc@west.net
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