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Orbital decay is a gradual decrease of the distance between two orbiting bodies at their closest approach (the periapsis) over many orbital periods. These orbiting bodies can be a planet and its satellite , a star and any object orbiting it, or components of any binary system .
The rate of orbital decay depends on the satellite's cross-sectional area and mass, as well as variations in the air density of the upper atmosphere. At altitudes above 800 km (500 mi), orbital lifetime is measured in centuries. [96] Below about 300 km (190 mi), decay becomes more rapid with lifetimes measured in days.
The first indirect evidence for the existence of gravitational waves came in 1974 from the observed orbital decay of the Hulse–Taylor binary pulsar, which matched the decay predicted by general relativity as energy is lost to gravitational radiation.
[5] KELT-1b's density of 22.1 +5.62 −9.16 g/cm 3 is the highest among well characterized planets. [4] The planetary orbit is well aligned with the equatorial plane of the star, with the misalignment angle equal to 2 ± 16°. [2] Despite the short orbital period, orbital decay of KELT-1b has not been detected as of 2018. [7]
Spacecraft experience orbital decay due to drag. To maintain their orbit, thrusters are used to reboost the spacecraft to a higher altitude. Because on board propellant capacity is limited, the spacecraft can only perform a limited number of momentum desaturations or reboosts.
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