UNIVERSE
CELESTIAL MECHANICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -A highly elliptical orbit (HEO) is an elliptic orbit with a low-altitude (about 1, 000 kilometers) perigee and a high-altitude (over 35, 786 kilometers) apogee. Such extremely elongated orbits have the advantage of long dwell times at a point in the sky during the approach to, and descent from, apogee.
Detailed explanation-2: -Apogee. Apogee is the maximum altitude above the Earth’s surface attained during the spacecraft’s orbit. Its value is input to the CREME software in either km or nautical miles. Perigee. Perigee is the minimum altitude above the Earth’s surface attained during the spacecraft’s orbit.
Detailed explanation-3: -The orbital paths of the moon around the earth and the earth around the sun are both elliptical. The point in the moon’s orbit where it is farthest from the earth is called apogee, while it’s closest approach is known as perigee.