Day 9 Complete

Question 1

What is the movement of a satellite due to changing mission requirements?

Answer 1

Station Changing

Question 2

What are small maneuvers needed at regular intervals to keep a satellite in its desired position?

Answer 2

Station Keeping

Question 3

What is the term for maneuvering a satellite to an unused orbit where it will not affect other active satellites?

Answer 3

Disposal Orbit

Question 4

What is the term for maneuvering a satellite to reenter the atmosphere and burn up?

Answer 4

De-Orbit

Question 5

What is changed as a result from Radial Maneuvers?

Answer 5

Argument of Perigee and Eccentricity

Question 6

What maneuver is similar to hitting the gas or brake in your car, allowing the satellite to speed up or slow down but continue moving in the direction it was already traveling?

Answer 6

In-Track Maneuver

Question 7

What do in-track maneuvers significantly alter?

Answer 7

The semi-major axis and eccentricity of an orbit

Question 8

What are ‘out-of-plane’ and alter the inclination of the orbit?

Answer 8

Cross-track maneuvers

Question 9

What will be affected if a cross-track maneuver is conducted anywhere other than ascending or descending nodes?

Answer 9

RAAN

Question 10

What will change when conducting a cross-track burn?

Answer 10

Inclination

Question 11

What requires two in-track maneuvers to move from one circular orbit to another circular orbit?

Answer 11

Hohmann transfer

(most efficient method to change circular orbits)

Question 12

What is a Simple Plane Change?

Answer 12

An Inclination or RAAN change without changing semi-major axis, eccentricity, or argument of perigee

Question 13

GSO and LEO costs (m/s)

Answer 13

GSO costs 50 m/s per degree change
LEO costs 130 m/s per degree change

Question 14

What is a plane change that occurs during the second burn of a Hohmann transfer?

Answer 14

Combined Plane Change

(uses less DeltaV)

Question 15

What is a satellite or other orbiting body which a spacecraft is attempting to rendezvous with?

Answer 15

Resident Space Object (RSO)

Question 16

What is a spacecraft that maneuvers to rendezvous with an RSO?

Answer 16

Chaser

Question 17

What two variables must be known and calculated to complete a rendezvous?

Answer 17

Burn and Timing

Question 18

What is the difference in mean motion, used to describe how quickly two satellites are moving relative to each other?

Answer 18

Drift Rate

Question 19

What is a co-orbital rendezvous?

Answer 19

Two satellites in the same orbit with different true anomalies

Question 20

How does a Chaser that is ahead of a satellite accomplish a rendezvous?

Answer 20

Positive
in-track burn

Question 21

How can the angular distance between the satellites be altered (catch-up cycle)?

Answer 21

Phasing orbit

NOT to be used in GEO, risk of colliding with another satellite

Question 22

How does a Chaser that is behind a RSO “catch up”?

Answer 22

Fire a negative in-track burn

(re-circularize with a negative in-track burn)

Question 22

What is Co-Planar Rendezvous?

Answer 22

Two satellites on the same plane (same Inclination and RAAN, different semi-major axis)

Question 23

What is required to get the Chaser satellite to the RSO’s orbit (Co-planar)?

Answer 23

Hohmann Transfer