CAT Coords are numerical errors associated with which TLE components?

CAT Coords are numerical errors associated with which TLE components?

• A. CE, VE, SE.
• B. RA, DEC, Alt.
• C. X, Y, Z.
• D. AU, LU, CU.

Answer: (A)

CAT coordinates describe the numerical inaccuracies that creep into a TLE’s representation of the satellite’s state. These errors are captured by three components: coordinate error (CE), velocity error (VE), and state error (SE). They reflect how far the TLE-derived position and velocity can deviate from the actual orbit due to modeling and fitting limitations, rather than actual sky coordinates or simple place-holder values. Since RA, DEC, Alt are observer sky coordinates, and X, Y, Z are just position components or other units like AU/LU/CU, they don’t represent the specific error terms tracked by CAT coordinates. The CE, VE, SE set directly represents the numerical error terms associated with the TLE’s state, making them the best match.

CAT coordinates describe the numerical inaccuracies that creep into a TLE’s representation of the satellite’s state. These errors are captured by three components: coordinate error (CE), velocity error (VE), and state error (SE). They reflect how far the TLE-derived position and velocity can deviate from the actual orbit due to modeling and fitting limitations, rather than actual sky coordinates or simple place-holder values. Since RA, DEC, Alt are observer sky coordinates, and X, Y, Z are just position components or other units like AU/LU/CU, they don’t represent the specific error terms tracked by CAT coordinates. The CE, VE, SE set directly represents the numerical error terms associated with the TLE’s state, making them the best match.