Twenty-five faint objects were sitting in geosynchronous orbit, roughly 36,000 kilometers (22,400 miles) above the equator, and nobody had logged them. A team led by researchers at the University of Warwick found them by going back over old telescope pictures.
Close to 80 percent of the newly found objects were missing from public catalogs of debris. The smallest are estimated at about five centimeters across, which makes them among the faintest debris ever seen in that orbit.
Old images, new method
The team did not take fresh observations. They reprocessed archival images from the 2.54-meter Isaac Newton Telescope in the Canary Islands, left over from an earlier geostationary debris survey. The technique is called blind stacking: images are aligned and summed along countless hypothetical paths until faint streaks rise above the background noise. The original analysis had missed all 25 objects.
Brightness readings showed that many of the fragments are tumbling, which causes periodic changes in the light they reflect. The study, “DebrisWatch II: Digging Deeper for Geosynchronous Debris,” appeared in the Journal of the Astronautical Sciences, dated June 24, 2026.
Why small pieces matter
Geosynchronous orbit holds the satellites behind communications, television broadcasting, weather forecasting and environmental monitoring. Objects there stay in step with Earth’s rotation.
Speed is the problem. “Pieces of space junk can be moving very quickly relative to one another, as much as several kilometers every second,” said Dr. James Blake of Warwick’s Centre for Space Domain Awareness, the lead author. “The energies involved are really high, and even small debris can cause a lot of damage to very expensive satellites, so small things really matter.”
Debris also lasts. Atmospheric drag at that height is essentially nonexistent, so fragments can linger for centuries.
Co-author Dr. Stuart Eves of SJE Space Ltd put it bluntly. “The debris in the neighborhood of the geostationary belt is a potential minefield,” he said. “No one in their right mind would enter a terrestrial minefield without a mine detector. Similarly, no one in their right mind should launch a satellite to GEO without an adequate debris survey.”
Widening the search
The project now reaches beyond Europe. Prof. Will Feline, senior principal scientist at the UK Defence Science and Technology Laboratory, said the team has partnered with large facilities in Australia and Japan, drawing on the Australian National University and JAXA. “Multinational collaboration is crucial for tackling a truly global challenge like space domain awareness,” he said.
By coordinating observations from widely separated sites, the group hopes to improve detection rates and apply blind stacking to more archival datasets. Blake says there are a finite number of orbital slots in the GEO belt, so it matters to know how much debris is out there and how it behaves.
Sources
- “A Potential Minefield” in Earth’s Orbit Has Scientists Sounding the Alarm Over Hidden Objects Threatening Critical Satellites
- Hidden Space Junk in Geostationary Orbit Threatens High-Value Satellites, Study Warns
- New Technique Uncovers 5‑Centimeter Space Junk in Geostationary Belt Threatening Satellites
