OEM Day 6

Question 1

Point where operators fire thrusters to push satellite away from dead band, moves satellite to other side of station keeping box

Answer 1

Control bound

Question 2

Point where satellite begins to drift back to control bound

Answer 2

Turn around bound

Question 3

Small propulsive maneuvers may be needed at regular intervals to keep the satellite in its desired position

Answer 3

Station Keeping

Question 4

A satellite may be moved due to changing mission requirements

Answer 4

Station Changing

Question 5

collision avoidance

Answer 5

• Planning starts when possibility of collision is identified
• Based off user-defined threshold criteria
  day 6, slide 6

Question 6

End of Life

Answer 6

• when satellites run out of fuel
• 2 options: disposal orbit or de-orbit

Question 7

Maneuvering a satellite to an unused orbit where it will not affect other active satellites

Answer 7

Disposal Orbit

Question 8

Maneuvering a satellite to reenter the atmosphere and burn up

Answer 8

De-Orbit

Question 9

Maneuvers are described as the change in a…

Answer 9

satellite’s velocity vector
a.k.a. delta-V or Δ𝑉

Question 10

delta-V or Δ𝑉

Answer 10

• satellite has moved
• change in velocity

Question 11

Radial maneuvers

Answer 11

Changes the
- argument of perigee (w, orientation)
- eccentricity (e, shape)

Question 12

In-Track Maneuvers

Answer 12

changes the:
- semi-major axis (a, size)
- eccentricity (e, shape)

Question 13

Cross-Track Maneuvers

Answer 13

changes the:
- inclination (i, tilt)
- RAAN (Omega, twist)
- affected only if cross-track is conducted anywhere but ascending or descending nodes
- further the nodes cross track is conducted the great the change in RAAN
out-of-plane

Question 14

Most efficient method to change from one circular orbit to another circular orbit

Answer 14

Hohmann Transfer

Question 15

For Hohmann Transfer, how many in-track maneuvers to move from one circular orbit to another circular orbit

Answer 15

requires two in-track maneuvers

Question 16

Simple Plane Change

Answer 16

Changing inclination or RAAN, without changing semi-major axis, eccentricity, or argument of perigee

Question 17

At GSO it costs about ___ m/s per degree change

Answer 17

50

Question 18

At LEO it costs about ___ m/s per degree change

Answer 18

130

Question 19

A plane change that occurs during the second burn of a Hohmann transfer

Answer 19

Combined Plane Change

Question 20

Combined Plan Change will happen in _______ of the transfer orbit. Why?

Answer 20

• apogee
• slowest point in the transfer