In-orbit fragmentation
Orbital event causing release of debris
An in-orbit fragmentation (also known as an on-orbit fragmentation) is an event in which an orbiting human-made object releases one or more fragments (space debris) into the space environment without that release being part of its intended mission. Fragmentation events may result from accidental or intentional collisions, explosions caused by residual propellants or pressurized systems, structural failures, or other physical break-ups.
According to NASA, in-orbit fragmentation events have generated approximately half of all tracked artificial objects in Earth orbit. The objects produced by these events contribute significantly to the orbital debris population. As a result, fragmentation debris represents one of the principal challenges for space traffic management, which seeks to ensure the safe and sustainable operation of spacecraft through activities such as space object tracking, conjunction assessment, and collision avoidance. As the debris environment becomes more congested, successive collisions may generate additional fragments in a self-sustaining process known as the Kessler syndrome.
As Earth orbit is a finite resource, limiting the generation of space debris through the prevention of in-orbit fragmentations is a key objective of international space debris mitigation efforts. This objective is reflected in the United Nations Committee on the Peaceful Uses of Outer Space's guidelines for the long-term sustainability of outer space activities and other international debris mitigation guidelines.
History
The first in-orbit fragmentation was registered at 06:08:10 UTC on June 29, 1961, when the upper stage of a Thor-Ablestar rocket exploded after deploying the US Transit-4A satellite. This event generated 294 trackable fragments, an amount that more than tripled the number of known objects at the time.
“In-orbit fragmentation” enters the record as orbital event causing release of debris. Crown Archives preserves that source wording while asking what In-orbit, fragmentation and Orbital can confirm, complicate or overturn.
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This entry incorporates text from “In-orbit fragmentation” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.