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What have I got and why in Ursa Major


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Last night I was setting up to see if I could get pics of the Double Cluster and had a play after Aligning with one or two doubles.

These shots are Alcor & Mizar both doubles but in one shot there appears to be triples and in the other just singletons. Why? and what am I seeing in the "triples" frame. Both 60 sec exposures with about an 800mm telephoto

11988_normal.jpeg

(click to enlarge)

11989_normal.jpeg

(click to enlarge)

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