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| Name of the Spacecraft/system | Country | Date of the Event | Notes/Details | Sources |
| XSS-10 | USA | January 2003 | XSS-10 did a series of maneuvers to bring it within 50 meters of the Delta upper stage that placed it in orbit | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| XSS-11 | USA | April 2005 - October 2006 | XSS-11 did a series of maneuvers to bring it close to the Minotaur upper stage that placed it in orbit. it then performed additional close approaches to other U.S. space objects in nearby LEO orbits over the next 12-18 months | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| SJ-O6F, SJ-12 | China | June - August 2010 | SJ-12 maneuvered to rendezvous with SJ-06F. Satellites may have bumped into each other. | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| GSSAP | USA | July 2014 - present | Two pairs of GSSAP satellites have been performing RPO with various other objects in the GEO region. (Geosynchronous Space Situational Awareness Program (GSSAP) satellites are a space-based capability operating in the near-geosynchronous orbit regime supporting U.S. Space Command space surveillance operations as a dedicated Space Surveillance Network (SSN) sensor. | https://www.afspc.af.mil/About-Us/Fact-Sheets/Display/Article/730802/geosynchronous-space-situational-awareness-program/ |
| | | GSSAP satellites collect space situational awareness data allowing for more accurate tracking and characterization of man-made orbiting objects. From a near-geosynchronous orbit, it has a clear, unobstructed and distinct vantage point for viewing Resident Space Objects (RSOs) without the interruption of weather or the atmospheric distortion that can limit ground-based systems. GSSAP satellites operate near the geosynchronous belt and have the capability to perform Rendezvous and Proximity Operations (RPO). RPO allows for the space vehicle to maneuver near a resident space object of interest, enabling characterization for anomaly resolution and enhanced surveillance, while maintaining flight safety. Data from GSSAP uniquely contributes to timely and accurate orbital predictions, enhancing our knowledge of the geosynchronous orbit environment, and further enabling space flight safety to include satellite collision avoidance.) | |
| ANGELS | USA | July 2014 - November 2017 | ANGELS separated from the Delta 4 upper stage that placed the first GSSAP pair into orbit and then performed a series of RPO in the GSO disposal region. (he Automated Navigation and Guidance Experiment for Local Space (ANGELS) program is managed by the Air Force Research Laboratory’s Space Vehicles Directorate, Kirtland AFB, NM. As part of Air Force Research Laboratory’s research in advanced Space Situational Awareness (SSA), the ANGELS program examines techniques for providing a clearer picture of the environment around our vital space assets.) | https://www.kirtland.af.mil/Portals/52/documents/AFD-131204-039.pdf?ver=2016-06-28-105617-297 |
| SY-7, CX-3, SJ-15 | China | July 2013 - May 2016 | SY-7 released an additional object that it performed maneuvers with and may have had a telerobotic arm. | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| | | CX-3 performed optical surveillance of other in-space objects. SJ-15 Demonstrated altitude and inclination changes to approach other satellites. | |
| Cosmos 2499 | Russian Federation | June 2014 - March 2016 | Cosmos 2499 did series of maneuvers to bring it close to, and then away from, the Briz-KM upper stage | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| Cosmos 2504 | Russian Federation | April 2015 - April 2017 | Cosmos 2504 maneuvers to approach the Briz-KM upper stage and may have had a slight impact before separating again. After a year of dormancy, Cosmos 2504 did a close approach with a piece of Chinese space debris from the 2007 ASAT test | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| SJ-17, YZ-2 upper stage | China | November 2016 - February 2018 | YZ-2 upper stage failed to burn to the graveyard orbit and stayed near GEO. SJ-17 demonstrated maneuverability around the GEO belt and circumnavigated Chinasat 5A. | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| Cosmos 2521 - Cosmos 2519 - Cosmos 2523 | Russian Federation | August 2017 - April 2018 | Cosmos 2521 separated from Cosmos 2519 and performed a series of small maneuvers to do inspections before redocking with Cosmos2519. Cosmos 2523 separated from Cosmos 2521 but did not maneuver on its own. Cosmos 2521 conducted close approaches of Cosmos 2519. | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| Mycroft - EAGLE | USA | May 2018 | EAGLE separated from the Delta V upper stage, EAGLE and Mycroft subsequently separated from EAGLE. Mycroft conducted RPO of EAGLE in the GEO region. | https://www.kirtland.af.mil/Portals/52/documents/EAGLE-factsheet.pdf |
| TJS-3, TJS-3 AGM | China | January - April 2019 | TJS-3 AKM separated from the TJS-3 in the GEO belt and both performed small maneuvers to maintain relatively | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| | | close orbital slots. | |
| Mycroft - S5 | USA | October 2019 | Mycroft maneuvered to rendezvous with S5 S5 after the latter ceased communications | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| Cosmos 2542 - Cosmos 2543 | Russian Federation | December 2019 - March 2020 | Cosmos 2542 released Cosmos 2543. Cosmos 2542 did station keeping with Cosmos 2542, then raised its orbit to come within 30 km of USA 245 and establish repeated close approaches within 150 km, likely for the purpose of surveillance. Cosmos 2542 also made close approaches to USA 245 | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |
| Cosmos 2535 | Russian Federation | June - October 2020 | Cosmos 2535 rendezvoused with Cosmos 2543 and released a small object at high relative velocity. In Sept, Cosmos 2536 joined in the RPO with the other two and may have docked with Cosmos 2535. | Weeden, Brian & Samson Victoria. Global counterspace capabilities: an open source assessment. Washington, DC : Secure World Foundation, 2018 |