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ronharper
Pooh-Bah
Reged: 02/14/06
Posts: 1001
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100 Hercules at 10x
06/09/08 05:25 PM
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Last night I looked at the double star 100 Hercules with my 10x50. It is a good test for this power, at 6.0 and 6.0 magnitude, with a 14.2 arcsec separation, according to a list on Eagle Creek Observatory's website.
I had tried a couple of nights before and failed to split it, but last night it came clean, barely, with a nice dark space. I had just tweaked the focus, which I rarely touch, a tiny bit, maybe that made the difference. In a true 10.0x, this would come out apparently separated by 2.37 arcmin. But the "10x50" I used (Fujinon) was measured by EdZ to have a true magnification of 10.4x, so if mine is like his, I had 2.46 arcmin to work with. I don't think I could have split it with any less than I had.
A curious thing about 100 Her is that it is located just south of a keystone-shaped asterism that looks just like the main body of Hercules proper. Cosmic, huh?
Can anybody split this with a genuine 10x? I bet 10x42 or 10x32 would be better than 10x50--less light to deal with and probably smaller spots. Less than 10x, no way! How about 11x56?
Ron
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