A satellite is revolving in an elliptical orbit in free space; then which of the following statements are true :

Since no dissipative force is acting on the satellite , its total energy remains constant .

Since the line of action of the gravitational force of attraction passes through the centre of earth , its moment about the centre of earth is zero and hence the angular momentum about the centre of earth remains constant .

Areal velocity =$\frac{L}{2m} where L is the angular momentum and m is the mass of satellite .$Since L remains constant , areal velocity also remains constant.