`T = 2pi * sqrt( "a" ^3/mu)`

Enter a value for all fields

The Orbit Period [a, `mu`] calculator computes the orbital period based on the semi-major axis of the elliptical orbit and the mass of the primary object (e.g., star or planet)

INSTRUCTIONS: Choose units and enter the following:

• (a) Semi-major Axis
• (M)  Mass of Primary Body

Orbit Period [a, `mu`] (T): The period is returned in days.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The Orbit Period [a, `mu`] equation computes the period of a satellite's orbit around the earth based on the inputs of the semi-major axis, a,  and the Earth's gravitational constant, `mu`.