Jeff Goldmember  1,462 posts Likes: 28 Joined Nov 2007 Location: 42° 34' N 87° 55' W Kenosha, WI More info | Sep 15, 2009 20:05 | #1 I love to show people this object. It's neat to see the reaction when they see that one star becomes two, then those two become four as you increase the power. This is at about 300x through a 6" refractor (4mm eyepiece in the camera adapter). 50D, 2sec, ISO400, f8  HOSTED PHOTO please log in to view hosted photos in full size. Jeff
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BobOh Goldmember  1,157 posts Likes: 1 Joined May 2006 Location: Central Wisconsin More info | Sep 17, 2009 17:41 | #3 How close are the stars actually? Is each "pair" a binary? Regards,
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Madweasel Cream of the Crop  6,224 posts Likes: 61 Joined Jun 2006 Location: Fareham, UK More info | Sep 19, 2009 14:50 | #4 The four stars are all part of the same system: the stars in each of the two close pairs orbit each other, one in about 1200 years (separated by about 140AU), the other around half that period (and therefore something like 100AU apart). The two pairs are separated by about 0.16ly, and orbit in around 500,000 years. Mark.
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