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Space Shit > DONE--OEM 101.2 > Flashcards

DONE--OEM 101.2 Flashcards

Central and Third Body Effects

1
Q

Orbital perturbations are caused by deviations from what?

A

The standard two-body problem

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2
Q

What is the largest perturbing force present for near Earth objects?

A

The mass and shape of the Earth

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3
Q

What is the largest central body effect?

A

J2 effect

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4
Q

Which COEs are most affected by the J2 effect?

A

RAAN and Argument of Perigee

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5
Q

What causes the change in RAAN caused by the J2 effect?

A

Nodal Regression

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6
Q

Prograde orbits will precess which direction during Nodal Regression?

A

West

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7
Q

Retrograde orbits will precess which direction during Nodal Regression?

A

East

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8
Q

At what inclination is Nodal Regression greatest?

A

O°

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9
Q

At what inclination is Nodal Regression not present?

A

90°

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10
Q

The larger the ________, the smaller the effects of Nodal Regression.

A

Semi-major axis

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11
Q

Apsidal Rotation causes which COE to change over time?

A

Argument of Perigee

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12
Q

Orbiting satellites experience no Apsidal Rotation (Argument of Perigee is stationary) at what inclination?

A

63.4°

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13
Q

What are the two points along the equator caused by Earth’s mass asymmetry?

A

Gravity wells

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14
Q

Which orbit do gravity wells have the greatest effect?

A

GEO

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15
Q

Any celestial body that is not Earth causes what gravitational effects?

A

Third-Body Effects

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16
Q

What do Third-Body Effects allow for?

A

Five Lagrange Points

17
Q

Third-Body Effects have the greatest effect in which orbit?

A

GEO

18
Q

Atmospheric drag affects which COEs?

A

Semi-major axis and eccentricity

19
Q

Atmospheric drag has the greatest effect on satellites with ____ mass and ____ surface area.

A

Lower / Higher

20
Q

What does Earth’s rotation provide to satellites launched into prograde orbit?

A

Initial velocity

21
Q

How many opportunities does a space launch complex have when its latitude is greater than the desired inclination?

A

0

22
Q

How many opportunities does a space launch complex have when its latitude is equal to the desired inclination?

A

1

23
Q

How many opportunities does a space launch complex have when its latitude is less than the desired inclination?

A

2

24
Q

What determines the RAAN of the final orbit?

A

Launch time

25
Q

What causes the largest perturbing force for near Earth objects?

A

Earth’s mass and shape

26
Q

RAAN and Argument of Perigee are affected by which central body effect?

A

J2

27
Q

What causes Nodal Regression and Apsidal Rotation?

A

The oblateness of Earth

28
Q

Apsidal Rotation will cause an orbit with i116.6 to rotate its Argument of Perigee in which direction?

A

Same direction of spacecraft motion

29
Q

Apsidal Rotation will cause an orbit with 63.4°< i <116.6 to rotate its Argument of Perigee in which direction?

A

Opposite direction of spacecraft motion

30
Q

What two locations on Earth will pull GEO satellites towards their location over time?

A

75°E and 107°W

31
Q

What is primarily responsible for Third-Body Effects on GEO satellites?

A

Moon

32
Q

Which orbit does solar radiation affect the most?

A

GEO

33
Q

Which reference frame is best for viewing ground tracks?

A

ECEF

34
Q

Which COEs affect the ground track’s appearance?

A

Semi-major axis, Inclination, Eccentricity, and Argument of Perigee

35
Q

Launches from what location on Earth deliver the greatest velocity boost?

A

Equator

36
Q

Launching directly East results in what inclination?

A

Matches latitude of the launch location

37
Q

What launch consideration affects the RAAN of the orbit?

A

Timing of the launch

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