The Orbiteers

Geocentric orbit Geocentric orbit Orbit around Earth A geocentric orbit, Earth-centered orbit, or Earth orbit involves any object orbiting Earth, such as the Moon or artificial satellites. In 1997, NASA estimated there were approximately 2,465 artificial satellite payloads orbiting Earth and 6,216 pieces of space debris as tracked by the Goddard Space Flight Center.[1] More than 16,291 objects previously launched have undergone orbital decay and entered Earth's atmosphere.[1] This article needs additional citations for verification. (December 2015) A spacecraft enters orbit when its centripetal acceleration due to gravity is less than or equal to the centrifugal acceleration due to the horizontal component of its velocity. For a low Earth orbit, this velocity is about 7.8 km/s (28,100 km/h; 17,400 mph);[2]…

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