4. The orbit of asteroid Vesta has a semimajor axis of 2.36 AU and an eccentricity of 0.089. Its mass is 2.59x1020 kg and, like all asteroids, it orbits the Sun, whose mass is 1.99x1030 kg. Calculate Vesta's: a) orbital period, in years b) aphelion and perihelion distances, in AU c) orbital velocity, in km/s d) gravitational pull on the Sun when it is at perihelion, in Newtons