This pertains to a homework question but I get the concept of PE or U = -GmM/a for an elliptical orbit. I also understand the derivation of the total energy of an object in an elliptical orbit as E = -GmM/2a. However, I have a homework question that asks for the ratio of an object's kinetic energy to total energy in orbit, and the problem states to use the relationship of K/E = 1 - U/E. However, wouldn't U/E be greater than 1 since E has a denominator of 2a while U has a denominator that is always smaller than 2a? This would force U to be greater than E, which would mean U/E is greater than 1, which leads to a K/E greater than 1. How does this make sense?