What does deorbit mean?
"Deorbit" is a technical verb meaning to bring a spacecraft or satellite out of orbit, usually by firing its engines against the direction of travel so that its path intersects the atmosphere or the surface of the planet below. Space agencies plan such maneuvers carefully: a controlled deorbit steers a defunct satellite toward a designated drop zone, most famously Point Nemo in the Pacific Ocean, where debris can fall without endangering people. Used transitively, as in "engineers deorbited the satellite," it emphasizes deliberate action; used intransitively, as in "the capsule deorbited," it describes the craft's own departure from orbit. The word belongs firmly to the vocabulary of aerospace engineering and appears chiefly in mission reports, regulatory discussions about space debris, and science coverage. Its opposite idea — placing something into orbit — has no single-word counterpart, which makes "deorbit" a compact and precise piece of space-age terminology.
verbTo cause a spacecraft or satellite to leave its orbit, typically by firing its engines so that it descends toward Earth or another body, often resulting in reentry or a controlled crash; used intransitively, it means to move out of orbit in this way.
- (transitive) To deliberately remove a spacecraft or satellite from orbit, usually by a retrograde engine burn that sends it on a descent path.
- (intransitive) Of a spacecraft, to depart from orbit and begin descent.
"Mission controllers commanded the aging satellite to deorbit over the Pacific Ocean, where any surviving debris would fall harmlessly into the spacecraft graveyard."
"The International Space Station is expected to be safely deorbited into the Pacific at the end of its operational life."
"After completing its mapping mission, the probe deorbited and burned up in the atmosphere."
When a dead satellite is told to deorbit, engineers are essentially aiming tonnes of falling metal metal at an empty stretch of ocean called Point Nemo — the most remote place on Earth.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deorbit
Formed within English from the Latin-derived prefix "de-" (indicating removal or reversal) combined with "orbit," which traces back to Latin "orbita," meaning a wheel track or rut, from "orbis" (circle or disk). The word arose in twentieth-century aerospace usage alongside humanity's first satellites, once leaving orbit became a planned operation rather than a natural decay. It shares the root "orbita" with words such as "orbital," "orb," and "exorbitant."
How deorbit is actually used
A technical term used almost exclusively in aerospace contexts — space agency reports, engineering literature, and science journalism. It is neutral in tone but carries connotations of deliberate, controlled action; unplanned falls from orbit are more often described as "uncontrolled reentry." The spelling is sometimes hyphenated as "de-orbit," especially in older or more formal texts.
Easily confused with deorbit
"Reorbit" means to place a spacecraft back into or into a new orbit, while "deorbit" specifically means to take it out of orbit altogether.