Which of the following are inputs to a satellite tracking program?

To accurately predict a satellite's position in the sky, tracking software requires a specific set of mathematical parameters known as Keplerian elements. Named after the astronomer Johannes Kepler, these numbers describe the shape, size, and orientation of the satellite's orbit around the Earth. Because orbits naturally decay and shift over time due to atmospheric drag and Earth's gravitational variations, these Keplerian elements must be updated regularly in your tracking software to maintain accuracy. Options like the satellite's transmitted power or your last observed Doppler shift are not mathematical inputs used for orbital prediction; they are either fixed hardware specs or operational outcomes.