TUCSON, July 14 — A previously unknown swarm of debris in geosynchronous orbit, detected by a University of Arizona-led team, is now a central focus of NASA-funded space safety research. The figure that matters: a previously unknown cluster of objects in GEO, a region crowded with communications and weather satellites. Dr. Vishnu Reddy, a professor of planetary sciences at the university’s Lunar and Planetary Laboratory, leads the NASA-funded Space Debris Research Program.
His team uses optical telescopes to find and characterize debris in the geosynchronous belt, a key orbit where satellites match the planet’s rotation. The bottom line: Reddy’s 2024 study, published in Advances in Space Research, reported the discovery of the debris swarm.
It was detected using the 1.6-meter telescope at the Mount Graham International Observatory in Arizona. The finding highlights a growing blind spot in orbital monitoring. By the numbers, the discovery was a product of systematic sky surveys.
Reddy earned his Ph.D. in astronomy from the University of Hawaii in 2008. His work bridges planetary defense and orbital debris — he has contributed to NASA’s OSIRIS-REx mission, which sampled the asteroid Bennu, and has testified before the U.S. House Science Committee on space debris issues.
Investors will note that the debris problem has direct commercial implications. Geosynchronous orbit hosts hundreds of satellites worth billions of dollars, used for broadcasting, weather forecasting, and military communications. An untracked debris field raises collision risks for active spacecraft.
Reddy is also a member of the American Astronomical Society’s Division for Planetary Sciences. His research has been funded by NASA and the U.S. Air Force Office of Scientific Research.
The Debris Blind Spot
Most orbital debris tracking focuses on low Earth orbit, where the International Space Station and thousands of small satellites operate. GEO is harder to monitor. Objects there appear stationary from the ground, but debris can be small, faint, and hard to distinguish from stars.
Reddy’s program uses optical telescopes — not radar — to spot these objects. The 1.6-meter scope at Mount Graham can detect debris that other systems miss.
The 2024 swarm finding underscores how much remains unknown in that orbital regime.
What’s Next
Reddy testified before Congress in 2023 on the need for better debris surveillance. The House Science Committee heard his warning about gaps in tracking capability. With NASA and Air Force backing, his team continues to survey GEO for new debris populations.
The next step: expanding the survey to other orbital regions and characterizing the detected objects — determining their size, composition, and potential hazard. For operators of GEO satellites, the discovery means a new variable in collision avoidance calculations.
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