DONE--OEM 101.2

Question 1

Orbital perturbations are caused by deviations from what?

Answer 1

The standard two-body problem

Question 2

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

Answer 2

The mass and shape of the Earth

Question 3

What is the largest central body effect?

Answer 3

J2 effect

Question 4

Which COEs are most affected by the J2 effect?

Answer 4

RAAN and Argument of Perigee

Question 5

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

Answer 5

Nodal Regression

Question 6

Prograde orbits will precess which direction during Nodal Regression?

Answer 6

West

Question 7

Retrograde orbits will precess which direction during Nodal Regression?

Answer 7

East

Question 8

At what inclination is Nodal Regression greatest?

Answer 8

O°

Question 9

At what inclination is Nodal Regression not present?

Answer 9

90°

Question 10

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

Answer 10

Semi-major axis

Question 11

Apsidal Rotation causes which COE to change over time?

Answer 11

Argument of Perigee

Question 12

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

Answer 12

63.4°

Question 13

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

Answer 13

Gravity wells

Question 14

Which orbit do gravity wells have the greatest effect?

Answer 14

GEO

Question 15

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

Answer 15

Third-Body Effects

Question 16

What do Third-Body Effects allow for?

Answer 16

Five Lagrange Points

Question 17

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

Answer 17

GEO

Question 18

Atmospheric drag affects which COEs?

Answer 18

Semi-major axis and eccentricity

Question 19

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

Answer 19

Lower / Higher

Question 20

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

Answer 20

Initial velocity

Question 21

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

Answer 21

0

Question 22

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

Answer 22

1

Question 23

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

Answer 23

2

Question 24

What determines the RAAN of the final orbit?

Answer 24

Launch time

Question 25

What causes the largest perturbing force for near Earth objects?

Answer 25

Earth's mass and shape

Question 26

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

Answer 26

J2

Question 27

What causes Nodal Regression and Apsidal Rotation?

Answer 27

The oblateness of Earth

Question 28

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

Answer 28

Same direction of spacecraft motion

Question 29

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

Answer 29

Opposite direction of spacecraft motion

Question 30

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

Answer 30

75°E and 107°W

Question 31

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

Answer 31

Moon

Question 32

Which orbit does solar radiation affect the most?

Answer 32

GEO

Question 33

Which reference frame is best for viewing ground tracks?

Answer 33

ECEF

Question 34

Which COEs affect the ground track's appearance?

Answer 34

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

Question 35

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

Answer 35

Equator

Question 36

Launching directly East results in what inclination?

Answer 36

Matches latitude of the launch location

Question 37

What launch consideration affects the RAAN of the orbit?

Answer 37

Timing of the launch