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AE Orbital Mechanics Assessment (Part 3)

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Last updated about 2 hours ago
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Question 1
1.

The point in an orbit that is closest to the Earth.

Question 2
2.

What is the projection of a satellite's orbit onto the earth, represented in a 2D map called?

Question 3
3.

A satellite designed to take images to monitor the polar ice caps would have an inclination of ___ degrees.

Question 4
4.

A satellite crosses the equator in a northerly direction at 0 degrees longitude. On its next northerly pass over the equator it crosses at 23 degrees west longitude. How many minutes did it take this satellite to complete one orbit?

Question 5
5.
Draggable itemarrow_right_altCorresponding Item
The "tilt" of the orbit relative to the equator.
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Inclination
The point in the orbit of an object (such as a satellite) orbiting the earth that is the closest to the center of the earth.
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Eccentricity
Describes the size of an orbit. For circular orbits, altitude is often used in place of this term.
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Semi-Major Axis
The measure of how circular or elliptical an orbit is.
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Apogee
The point in the orbit of an object (such as a satellite) orbiting the earth that is at the greatest distance from the center of the earth.
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Perigee
Question 6
6.

Which orbital parameter must use a reference point in space, because an earth based reference point will move as the earth rotates?

Question 7
7.

_________________ is the angle between the Earth’s equatorial plane and the
plane of the orbit. It describes the tilt of the orbit.

Question 8
8.

An orbit with an inclination of 0 degrees is called:

Question 9
9.

An argument of perigee would be easiest to see in a picture of an orbit with which eccentricity?

Question 10
10.

This philosopher was the first to propose heliocentric theory.

Question 11
11.

This philosopher believed that everything rotates around the Earth.

Question 12
12.

To make the pictured ellipse more circular, you should move foci A and B _________.

Question 13
13.

Many of Kepler's theories were based on the documentation of this philosopher that he worked with for a short time.

Question 14
14.

Both size (semi-major axis and/or altitude) and eccentricity play an important role in determining the period of the orbit.

Question 15
15.

Which of the following orbital parameters describes the size and shape of the orbit?

Question 16
16.

Label each ellipse with the correct eccentricities.

Draggable itemarrow_right_altCorresponding Item
B
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0
C
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0.7
A
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0.4
Question 17
17.

Who developed the Keplerian Element Set which describes the orbital parameters of satellites' orbits?

Question 18
18.

Label the position indicated with the A in the pictured orbit.

Question 19
19.

A circular orbit has an apogee roughly twice the altitude of its perigee.

Question 20
20.

What two details of a satellite's orbit can be determined from examining a ground trace?

Question 21
21.

Kepler has two different sets of laws of orbital motion. One set applies to planets orbiting the Sun, and the other set applies to man-made satellites orbiting the Earth.

Question 22
22.

The value of which orbital parameter is 0 when the satellite is at its perigee point and 180 when the satellite is at apogee?

Question 23
23.

All circles are ellipses and all ellipses are circles.

Question 24
24.

Which is NOT one of the six elements of the Keplerian element set?

Question 25
25.

What is the name of the "radii" labelled A in the pictured ellipse?

Question 26
26.

An object is moving slowest at apogee.

Question 27
27.

The Voyager 1 spacecraft was launched in 1977 to explore the solar system and beyond. In 2008, it was entering the region between our solar system and interstellar space known as the heliosheath. It is the furthest manmade object from the Eatch and it continuing its journey into the unknown. Based on what you have learned about orbital elements, the eccentricity of Voyager is greater than 1.

Question 28
28.

This scientist was the first to use a telescope to help prove heliocentric theory.

Question 29
29.

Which of the following missions would probably use a polar orbit?

Question 30
30.

A geostationary satellite is called such because it is a satellite that doesn't move.

Question 31
31.

There is only one specified altitude for LEO (low earth orbit) satellites.

Question 32
32.

Why is there a ring of satellites around the Earth's equator roughly 22,000 miles away form the Earth?

Question 33
33.

You have recently moved to Australia. You took your satellite TV dish with you. When you mount it to your new house, in which direction should it face?

Question 34
34.

The lunar missions were LEO orbits.

Question 35
35.

Russia uses the Molniya orbit frequently. Which of the following countries could also benefit from this type of orbit?

Question 36
36.

The country of Ecuador rests on the equator. Why would a geostationary satellite not be a good choice for a satellite to take images of Ecuador?

Question 37
37.

Groups of satellites in various orbits that work together to accomplish a mission are called constellations.

Question 38
38.
Draggable itemarrow_right_altCorresponding Item
Low Earth Orbit
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Short orbital period of approx 90 minutes
Polar
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Period equals one day
Geostationary
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Highly inclined AND highly elliptical orbit
Molniya
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Inclination of 90 degrees
Question 39
39.

A Sun-synchronous orbit is a special type of polar orbit.

Question 40
40.

Which of the following men was responsible for the Laws of motion and gravitation?

Question 41
41.

A satellite is: (Select all that apply)

Question 42
42.

This is the ONLY PARAMETER that determines the orbital period.

Question 43
43.

An orbit with an inclination of 90 degrees is called:

Question 44
44.

Kepler's First Law states that:

Question 45
45.

Kepler's Second Law of Planetary Motion states that "A line joining a planet and its star sweeps out equal areas during equal intervals of time." Using this information, if a satellite's orbit is not circular, which of the following are true?