Knowra Orbital rendezvous Orbital rendezvous Orbital rendezvous is the controlled approach of two spacecraft in orbit until they meet or operate nearby. It requires matching their relative position and velocity, not merely reaching the same altitude.
Orbital mechanics : The study of the motion of spacecraft and other objects under gravity. Rendezvous maneuvers exploit how gravity and orbital geometry shape relative motion.
Apollo lunar orbit rendezvous : The Apollo mission strategy in which a lunar module met the command module in lunar orbit. It demonstrated rendezvous as the key to returning astronauts from the Moon.
Kepler's laws of planetary motion : Three laws describing how orbiting bodies move around a central body under idealized conditions. They explain why an object in a lower orbit can catch one in a higher orbit.
Launch window : A period when launch conditions permit a spacecraft to reach a desired destination or orbit. Launch timing can simplify later rendezvous, but it does not itself perform the approach.
Modular spacecraft : Spacecraft designed as separate units that can be assembled, replaced, or reconfigured. Rendezvous makes it possible to join modules after they have been launched separately.
Hohmann transfer orbit : An energy-efficient transfer between circular orbits using two engine burns and an elliptical path. A transfer orbit can change a chaser’s orbital altitude before its final approach.
Space Shuttle–Mir program : A program of Shuttle visits to the Russian Mir space station from 1995 to 1998. Repeated rendezvous enabled crew exchange, cargo delivery, and joint operations at Mir.
Orbital elements : Parameters that specify the size, shape, orientation, and position of an orbit. Comparing orbital elements reveals how the chaser’s path differs from the target’s.
Direct ascent : A mission trajectory that reaches a destination without first entering an intermediate orbit. It contrasts with rendezvous strategies that use a separate spacecraft or orbital meeting.
Space station : A crewed or uncrewed structure designed to remain in orbit for extended operations. Routine rendezvous turns orbital stations into destinations for crews, cargo, and experiments.
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