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Physics Midcourse Test
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- 1Compare LEO and geostationary satelliteA low Earth orbit is an orbit that lies above the Earth’s atmosphere but below the van Allen radiation belts. This means that its altitude is from approximately 250 km to 1 000 km above the surface of the Earth. A satellite in low Earth orbit will need an orbital velocity of approximately 28 000 km h-1 to maintain the orbit, which gives it an orbital period of approximately 90 minutes. Examples are the space shuttle (altitude 250–400 km) and the Hubble telescope (altitude 600 km).
A satellite in a geostationary orbit has an orbital period equal to the Earth’s, that is, it takes one sidereal day (23 hours 56 minutes) to complete an orbit. To achieve this, the satellite must have an altitude of approximately 35 800 km, which places it near the upper edge of the outer van Allen belt. Its orbital velocity is approximately 11 000 km h-1. From the ground, a satellite in this type of orbit appears fixed in the sky, which makes it especially useful for communications and weather satellites.
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- Fichas sobre Physics Midcourse Test , creado por Vi Vu el 29/12/2014.
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