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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 .
alpha → alpha decay; beta → beta decay; b-→ beta minus decay (R) → Beta decay#beta minus decay2b-→ double beta minus decay (R) → Double beta decayb+ → beta plus decay (R) → Positron emission
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To improve tracking, NORAD employee John Gabbard kept a separate database. Studying the explosions, Gabbard developed a technique for predicting the orbital paths of their products, and Gabbard diagrams (or plots) are now widely used. These studies were used to improve the modeling of orbital evolution and decay. [9]
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