Chapter 4, Problem 25Q

(a)

To determine

The length of semi major axis of the comet’s orbit, if a certain comet is $2\text{ au}$ from the Sun at perihelion and $\text{16 au}$ from the Sun at aphelion.

(b)

To determine

The sidereal period of the orbit, if a certain comet is $2\text{ au}$ from the Sun at perihelion and $\text{16 au}$ from the Sun at aphelion.