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With a plot of log(T) against log(a) where 'T' is the period of satellite and 'a' the distance, I'm not sure what the y-intercept represents, something to do with the constant (4pi^2/GMm) I think, but not sure, any ideas?

Also, the y-intercept for me was -6.5, mean anything?

Thanks in advance

Nb, M>>m and M=ME