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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.
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.
In 2019, J. P. Marshall and associates proposed an orbital fit with lower eccentricities that is more stable. The new fit is closer to the 2:1 mean motion resonance. As the host star continues to evolve to a larger radius, it is expected that both planets will undergo orbital decay due to tidal forces and be engulfed. [6]
The planet's orbital period appears to be decreasing at a rate of 7.33 ± 0.71 milliseconds per year, suggesting that its orbit is decaying, with a decay timescale of 15.77 ± 1.57 million years. The anomalously high rate of orbital decay of WASP-4b is poorly understood as of 2021.
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]
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In April 2010, only five years into a planned 15-year mission, its operator, Intelsat, lost control of the satellite and it drifted out of its orbital slot. Several months later, on December 27, 2010, the satellite rebooted itself and began responding to commands again. [5] Intelsat re-positioned it back to its original orbital slot in April 2011.