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  2. Orbital decay - Wikipedia

    en.wikipedia.org/wiki/Orbital_decay

    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 .

  3. UAH satellite temperature dataset - Wikipedia

    en.wikipedia.org/wiki/UAH_satellite_temperature...

    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.

  4. Hulse–Taylor pulsar - Wikipedia

    en.wikipedia.org/wiki/Hulse–Taylor_pulsar

    The period of the orbital motion is 7.75 hours, and the two neutron stars are believed to be nearly equal in mass, about 1.4 solar masses. Radio emissions have been detected from only one of the two neutron stars. The minimum separation at periastron is about 1.1 solar radii; the maximum separation at apastron is 4.8 solar radii. The orbit is ...

  5. ZTF J153932.16+502738.8 - Wikipedia

    en.wikipedia.org/wiki/ZTF_J153932.16+502738.8

    The orbital period is decreasing at 2.373 × 10 −11 seconds per second giving a characteristic timescale of 210,000 years. [1] This decay is mostly due to the emission of gravitational waves, however 7% of the decay could be due to tidal losses. [1] The decay is predicted to go for 130,000 years when the orbital period should reach 5 minutes.

  6. Simplified perturbations models - Wikipedia

    en.wikipedia.org/wiki/Simplified_perturbations...

    Simplified Deep Space Perturbations (SDP) models apply to objects with an orbital period greater than 225 minutes, which corresponds to an altitude of 5,877.5 km, assuming a circular orbit. [ 3 ] The SGP4 and SDP4 models were published along with sample code in FORTRAN IV in 1988 with refinements over the original model to handle the larger ...

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  8. Outer space - Wikipedia

    en.wikipedia.org/wiki/Outer_space

    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.

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