*Question T8B06:
Which of the following are inputs to a satellite tracking program?*  

*Correct Answer is  B: The Keplerian elements*  

### AI Response: (may contain errors)  

To understand the inputs to a satellite tracking program, let's analyze each choice:

1. **Correct Answer: B - The Keplerian elements**  
   - **Explanation**: The Keplerian elements are a set of parameters that describe the orbit of a satellite. They include values such as the semi-major axis, eccentricity, inclination, and more. These elements are essential for predicting the satellite's position in its orbit over time, making them crucial inputs for any satellite tracking program.

2. **Why the other choices are incorrect**:
   - **A: The satellite transmitted power**  
     - **Explanation**: While the transmitted power is important for understanding signal strength and communication quality, it does not directly affect the tracking of the satellite's position. Tracking relies on orbital mechanics rather than the power output of the satellite.
   
   - **C: The last observed time of zero Doppler shift**  
     - **Explanation**: The last observed time of zero Doppler shift can provide some information about the satellite's velocity relative to the observer, but it is not a fundamental input for tracking the satellite's orbit. It may help refine tracking but is not necessary for the basic calculations.

3. **Useful Formulas or Rules of Thumb**:
   - The Keplerian elements can be used in the following formula to predict the position of a satellite:
     - The position in orbit can be calculated using:
     $$ r = a(1 - e \cdot \cos E) $$
     where:
     - $r$ = distance from the central body (e.g., Earth)
     - $a$ = semi-major axis
     - $e$ = eccentricity
     - $E$ = eccentric anomaly

In summary, the Keplerian elements are the primary inputs needed for satellite tracking, while the other options, although relevant in different contexts, do not serve as fundamental inputs for tracking the satellite's orbit.