A comet of mass 1.9 x 1010 kg moves in an elliptical orbit around the Sun. Its distance from the Sun ranges between 0.480 AU and 56.0 AU. Note: 1 AU = one astronomical unit = the average distance from the Sun to the Earth =1.496 x 1011 m.
(a) What is the eccentricity of its orbit?
(b) What is its period?
(c) At aphelion what is the potential energy of the comet-Sun system?