US Army Space Cadre Basic Course (ASCBC): Day 1 Review Questions and Answers 100% Correct
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Course
Army Space Cadre
Institution
Army Space Cadre
US Army Space Cadre Basic Course
(ASCBC): Day 1 Review Questions and
Answers 100% Correct
Gravity A defining natural feature that is the reason why satellites are able to orbit around the
Earth
Period (T or P) how long it takes a satellite to make 1 full rotation around Earth
Apogee The po...
US Army Space Cadre Basic Course (ASCBC): Day 1 Review Questions and Answers 100% Correct Gravity A defining natural feature that is the reason why satellites are able to orbit around the Earth Period (T or P) how long it takes a satellite to make 1 full rotation around Earth Apogee The point at which a satellite is furthest away from Earth and travelling at its lowest/slowest velocity Perigee The point at which a satellite is closest to Earth and travelling at its highest/fastest velocity Prograde Rotational move ment that is With the Earth's normal rotation (counter -clockwise) Retrograde Rotational movement that is Against the Earth's normal rotation (clockwise) Ground Trace A projection of the satellite's orbit/path onto the Earth's surface Kepler's 3 Important Laws for Satellites Orbits, Areas, and Periods Law of Orbits The orbits of the planets are ellipses, with the sun at one focus Law of Areas The orbits of planets sweep out equal areas in equal time, think of Perigee (fast) and Apoge e (slow) Law of Periods The square of the period of any planet is proportional to the cube of the average distance to the sun. ie: larger orbits have larger periods US Army Space Cadre Basic Course (ASCBC): Day 1 Review Questions and Answers 100% Correct Classical Orbital Elements give us an address in space as to where a satellite is at any given time Semi -Major Axis Orbit Size (a) Eccentricity Orbit Shape (c/a), a measure of how round an orbit is with 0 being a perfect circle and 1 launching satellites out of orbit Inclinations Orbital Tilt (i) from 0 to 180 with respe ct to the equator Right Ascension of the Ascending Node Orbit Twist ( Ω) (Argument of Perigee) angle measured along the orbital path between the ascending node and perigee Orbit Rotation ( ω) True Anomoly Satellite Position (v) Orbit Inclination relationship to Ground Trace It determines the maximum latitude that t he ground trace will reach both above and below the equator. sun-synchronous orbit an orbital path set up so that the satellite always crosses the same areas at the same local time. This allows for the use of shadow analysis. LEO Definition Low E arth Orbit LEO Description From 200 -900 miles 90-120 minute periods Varied Inclination
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