Comet Grigg. skjellerup(yes thats its real name) has an orbital period of 5.09 years.
a. Find the comets orbital semi-major axis in astronomical units?
b. If the closest approach of comet grigg-skjellerup to the sun is 0.989 AU, find the comets orbital eccentricity?
c. Find what is the greates distance of comet grigg-skjellerup from the sun?