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Space Shit > OEM 2 > Flashcards

OEM 2 Flashcards

1
Q

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

A

Station Changing

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2
Q

What consists of small maneuvers that may be needed at regular intervals due to orbital perturbations that caused satellites to drift from their desired position/orbit?

A

Station Keeping

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3
Q

What boundary requires operators to fire thrusters to station keep?

A

Control Bound

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4
Q

What boundary causes satellites to naturally drift to station keep?

A

Turn Around Bound

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5
Q

Which maneuver is required when the threat of conjunction reaches user-defined threshold criteria?

A

Collision Avoidance

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6
Q

Where are satellites maneuvered when they reach end of life?

A

Disposal orbit or de-orbit into the Earth’s atmosphere

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7
Q

Maneuvers change which vector for the satellite?

A

Velocity

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8
Q

Which COEs do in-track maneuvers change?

A

Semi-major axis and eccentricity

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9
Q

Which COEs do radial maneuvers change?

A

Argument of Perigee and Eccentricity

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10
Q

Which COEs do cross-track maneuvers change?

A

Inclination and/or RAAN

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11
Q

Where must cross-track maneuvers be conducted to maintain RAAN?

A

Ascending or descending node

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12
Q

What maneuvers make up a Hohmann transfer?

A

Two in-track maneuvers

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13
Q

What is the time of flight for a Hohmann transfer?

A

Half the period of the transfer orbit

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14
Q

Which maneuver changes inclination or RAAN while keeping all other COEs the same?

A

Simple plane change

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15
Q

At GSO, how much does ∆V cost per degree change?

A

50 m/s

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16
Q

At LEO, how much does ∆V cost per degree change?

A

130 m/s

17
Q

Which is less expensive: plane change maneuvers or non-plane change maneuvers?

A

Non-plane change maneuvers

18
Q

Which is more efficient when conducted farther from Earth: plane change maneuvers or non-plane change maneuvers?

A

Plane change maneuvers

19
Q

Where should the second burn of a Hohmann transfer (combined plane change) occur to save fuel?

A

Slowest point of the orbit (Apogee)

20
Q

Where is a satellite maneuvered during rendezvous?

A

Close to another satellite or a point in space

21
Q

What are 6 reasons for conducting rendezvous?

A
  1. Service an existing satellite
  2. Refuel a satellite
  3. Inspect a satellite
  4. Intercept a satellite
  5. Fill a constellation slot
  6. Fill a geostationary longitude slot
22
Q

What two variables must be determined to conduct a rendezvous?

A

Burn (direction/magnitude/∆V) and Timing

23
Q

What is the difference in two satellites’ mean motion relative to each other?

A

Drift Rate

24
Q

Which rendezvous is used for two satellites in the same orbit, but different true anomalies?

A

Co-orbital

25
Q

How does a chaser satellite speed up to catch an RSO in the same orbit?

A

Negative in-track burn to decrease orbit size

26
Q

How does a chaser satellite slow down to catch an RSO in the same orbit?

A

Positive in-track burn to increase orbit size

27
Q

What does a phasing orbit alter between two satellites?

A

Angular distance

28
Q

Multiple phasing orbits saves fuel for which rendezvous: co-orbital or co-planar?

A

Co-orbital

29
Q

Which should be used for co-planar rendezvous to save fuel: multiple phasing or Hohmann transfer?

A

Hohmann transfer

30
Q

For co-planar rendezvous, which 2 COEs must be the same? Which one must be different?

A

Inclination and RAAN / Semi-major axis

31
Q

What must be correct for a fuel-efficient co-planar rendezvous via Hohmann transfer?

A

Angle between the chaser and RSO

32
Q

Plane-matching rendezvous are always required when launching satellites into which orbit?

A

Geostationary

33
Q

When should a plane-matching rendezvous be conducted for fuel efficiency?

A

Apogee

Space Shit (10 decks)

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