<Dd> v = 1.327 × 10 20 m 3 s − 2 ⋅ (2 1.471 × 10 11 m − 1 1.496 × 10 11 m) ≈ 30, 300 m / s (\ displaystyle v = (\ sqrt (1.327 \ times 10 ^ (20) ~ m ^ (3) s ^ (- 2) \ cdot \ left ((2 \ over 1.471 \ times 10 ^ (11) ~ m) - (1 \ over 1.496 \ times 10 ^ (11) ~ m) \ right))) \ approx 30,300 ~ m / s) </Dd> <P> which is slightly faster than Earth's average orbital speed of 29,800 m / s, as expected from Kepler's 2nd Law . </P> <Table> <Tr> <Th> orbit </Th> <Th> Center - to - center distance </Th> <Th> Altitude above the Earth's surface </Th> <Th> Speed </Th> <Th> Orbital period </Th> <Th> Specific orbital energy </Th> </Tr> <Tr> <Td> Standing on Earth's surface at the equator (for comparison--not an orbit) </Td> <Td> 6,378 km </Td> <Td> 0 km </Td> <Td> 465.1 m / s (1,674 km / h or 1,040 mph) </Td> <Td> 23 h 56 min </Td> <Td> − 62.6 MJ / kg </Td> </Tr> <Tr> <Td> Orbiting at Earth's surface (equator) </Td> <Td> 6,378 km </Td> <Td> 0 km </Td> <Td> 7.9 km / s (28,440 km / h or 17,672 mph) </Td> <Td> 1 h 24 min 18 sec </Td> <Td> − 31.2 MJ / kg </Td> </Tr> <Tr> <Td> Low Earth orbit </Td> <Td> 6,600--8,400 km </Td> <Td> 200--2,000 km </Td> <Td> circular orbit: 7.8--6.9 km / s (17,450--14,430 mph) respectively elliptic orbit: 6.5--8.2 km / s respectively </Td> <Td> 1 h 29 min--2 h 8 min </Td> <Td> − 29.8 MJ / kg </Td> </Tr> <Tr> <Td> Molniya orbit </Td> <Td> 6,900--46,300 km </Td> <Td> 500--39,900 km </Td> <Td> 1.5--10.0 km / s (3,335--22,370 mph) respectively </Td> <Td> 11 h 58 min </Td> <Td> − 4.7 MJ / kg </Td> </Tr> <Tr> <Td> Geostationary </Td> <Td> 42,000 km </Td> <Td> 35,786 km </Td> <Td> 3.1 km / s (6,935 mph) </Td> <Td> 23 h 56 min </Td> <Td> − 4.6 MJ / kg </Td> </Tr> <Tr> <Td> Orbit of the Moon </Td> <Td> 363,000--406,000 km </Td> <Td> 357,000--399,000 km </Td> <Td> 0.97--1.08 km / s (2,170--2,416 mph) respectively </Td> <Td> 27.3 days </Td> <Td> − 0.5 MJ / kg </Td> </Tr> </Table> <Tr> <Th> orbit </Th> <Th> Center - to - center distance </Th> <Th> Altitude above the Earth's surface </Th> <Th> Speed </Th> <Th> Orbital period </Th> <Th> Specific orbital energy </Th> </Tr>

A satellite is orbiting close to the surface of the earth then its speed is
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