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Space Missions and Orbit Determination Quiz

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Questions and Answers

What is the minimal set of parameters required for orbit determination?

(a, e) (semi-major axis, eccentricity) at a given time
(r, v) (position, velocity) at a given time (correct)
(i, Ω) (inclination, longitude of the ascending node) at a given time
(T, M) (true anomaly, mean anomaly) at a given time

What are the measurements linked to the dynamical state used in orbit determination?

Voltage, current, resistance
Range, range-rate, angles (correct)
Temperature, pressure, humidity
Mass, volume, density

What causes the predicted values of the orbit to differ from the true ones?

Errors or inadequacy of the dynamical model (correct)
Environmental disturbances
Errors in the measurement devices
Inaccuracies in the numerical procedure

What is the consequence of errors in the numerical procedure in orbit determination?

The state determination must be repeated (D) Signup and view all the answers

Why is it virtually impossible to propagate the state of a spacecraft for very long times without incurring in serious discrepancies?

Due to errors or inadequacy of the dynamical model (B) Signup and view all the answers

What is the primary task of every mission controller?

Determining and controlling the spatial orientation of a spacecraft (C) Signup and view all the answers

What is the specific task of a geostationary telecommunication satellite?

Keeping its antennas pointed toward certain geographical regions of the Earth (B) Signup and view all the answers

What is the purpose of a spin‐stabilized satellite?

Keeping the spin axis of its body pointed at some particular direction in space (A) Signup and view all the answers

What is the role of a nadir‐pointing three‐axis−stabilized satellite?

Keeping its three Euler angles close to null relative to the orbit reference frame (B) Signup and view all the answers

What is the design purpose of the Attitude Control System (ACS) in Earth‐observation satellites?

Allowing cameras and sensors to track defined targets on the earth surface (C) Signup and view all the answers

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