An Angara 1.2 rocket launches the Kosmos 2560 satellite, thought to be called EMKA-3, into orbit from Plesetsk Cosmodrome in northern Russia on Oct. 15, 2022. Another trio in the Kosmos series — Kosmos 2581, 2582 and 2583 — launched in February 2025 and shortly thereafter released a mystery object into orbit. (Image credit: Roscosmos)
A trio of secretive Russian satellites launched earlier this year has released a mysterious object into orbit, sparking interest among space trackers and analysts.
The three satellites <www.space.com/24839-satellites.html>, designated Kosmos 2581, 2582 and 2583, launched on a Soyuz-2.1V rocket <www.space.com/29295-rocket-history.html> from Plesetsk cosmodrome early on Feb. 2 (GMT). Since then, the satellites, whose purpose is unknown, have displayed interesting behavior, while in a near-polar orbit roughly 364 miles (585 kilometers) above Earth <www.space.com/54-earth-history-composition-and-atmosphere.html>.
In March, the satellites appeared to be conducting potential proximity operations <x.com/planet4589/status/1901504158978466235>, or maneuvering close to other objects in space, according to Jonathan McDowell, an astrophysicist and spaceflight activity tracker.
Following this, the U.S. Space Force <www.space.com/us-space-force-history-mission-capabilities> cataloged a new object in orbit, which was possibly released <x.com/planet4589/status/1902194648090558919> by Kosmos 2581 on March 18.
Russia has provided no details about the satellites and their mission. Many Kosmos missions are classified.
The released object could be used for a number of objectives, including military experiments, such as satellite inspection or target practice, testing technology for docking or formation flying. It may also be a scientific payload or even the result of an unintentional fragmentation, though this would usually result in numerous pieces of debris.
*Related: **Pentagon space chief condemns ‘irresponsible’ launch of Russian inspector satellite* <www.space.com/russia-inspector-satellite-kosmos-2558-irresponsible-behavior>
GO HERE FOR MORE www.space.com/space-exploration/satellites/secretive-russian-military-satellites-release-mystery-object-into-orbit
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