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Splitting Alpha Centauri
I have stupid question. How do you imagine close binaries? I can just split Alpha Centauri binary visually with 25mm eyepiece and 120mm refractor but with CCD camera (even it equals about 7mm eyepiece magnification) image comes up as one star. I know it is due to Airy disk size and that the eye got "smaller pixel" size. Anyone knows the formula how to calculate lowest angular resolution for given pixel size of CCD and telescope focal lenght? I have searched Web for split image of Alpha Centauri and I found only one image and it was taken in infrared.
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