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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 sensors deteriorate over time, and corrections are necessary for satellite drift and orbital decay. Particularly large differences between reconstructed temperature series occur at the few times when there is little temporal overlap between successive satellites, making intercalibration difficult.
The orbital decay of Kosmos-1408 since 1980, compared with the ISS. Kosmos-1408 was part of the Tselina-D system. [5] [6] It had a mass of around 1,750 kg (3,860 lb), [7] [8] and a radius of around 2.5 m (8 ft 2 in). [9] It is thought to have replaced Kosmos-1378 in the Tselina system, since it was launched into a similar orbital plane. [4] [10]
[5] [6] As the first weather satellite and one of the first orbital space missions, the launch of Vanguard 2 was an important milestone in the Space Race between the United States and the Soviet Union. [7] [8] [5] Vanguard 2 remains in orbit. The Universal newsreel about Vanguard 2 The Vanguard 2 satellite sketch
Growth is aided by orbital decay of smaller bodies due to gas drag, which prevents them from being stranded between orbits of the embryos. [26] [27] Further collisions and accumulation lead to terrestrial planets or the core of giant planets.
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At higher altitudes, where air drag is less significant, orbital decay takes longer. Slight atmospheric drag , lunar perturbations , Earth's gravity perturbations, solar wind , and solar radiation pressure can gradually bring debris down to lower altitudes (where it decays), but at very high altitudes this may take centuries. [ 57 ]
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