- LES-5, designed by MIT, was designed to pioneer satellite communications.
- The satellite operated from 1967 to 1971, when it was decommissioned.
- In March 2020, the satellite was rediscovered in geosynchronous orbit, still broadcasting nearly fifty years after it was retired.
An amateur radio hobbyist has zeroed in on the signal of a U.S. military satellite abandoned nearly fifty years ago. The LES-5 satellite, launched in 1967, was an early experiment in satellite-based communications broadcasting continuously since it was launched in 1967. It was decommissioned and placed in a “graveyard orbit” in 1972. But incredibly it’s still working and is transmitting to anyone able to listen.
Scott Tilley, an amateur radio operator living in British Columbia, makes a hobby of re-establishing contact with long-lost satellites. Tilley has helped NASA locate the IMAGE satellite, lost for 13 years in Earth’s orbit, as well as one of the U.S. Navy’s Transit series of navigational satellites. Recently Tilley took interest in LES-5, an experimental satellite developed by MIT’s Lincoln Lab and launched into orbit in 1967.
LES-5 was part of a series of experiments to determine the viability of a satellite-based military communications program. In August 1958, the HARDTACK I series of high altitude atmospheric nuclear tests disrupted high frequency radio communications across the Pacific Ocean. Military planners, worried about the loss of communications in the event of a nuclear war, wanted to use satellite relays to keep military units connected. The Lincoln Experimental Satellite, or LES series of satellites were designed to test the viability of using the ultra high frequency (UHF) band to give the armed forces a secure comms system.
There were nine LES satellites in all. LES-5 was launched in 1967 and placed in geosynchronous orbit 22,000 feet above the Earth. It remained active until May 1971, when it was deactivated.
Tilley, inspired by another satellite hunter who discovered LES-1 in 2016, decided to go looking for LES-5. A shelter in place order for the coronavirus gave him a lot of time at home, according to NPR, and he went to work “looking for a needle in a haystack,” as he writes on his blog. On March 24, he located the signal for the LES-5 satellite at 237MHz, then made the announcement on Twitter:
Well folks, here's what appears to be a new ZOMBIE SAT!— Scott Tilley (@coastal8049) March 25, 2020
LES-5 [2866, 1967-066E] in a GEO graveyard orbit.
Confirmation will occur at ~0445 UTC this evening when the satellite should pass through eclipse.
If so this is definitely the oldest emitting GEOsat I know of. pic.twitter.com/QFSRb5bT1I
Not only does the satellite still have power, thanks to its onboard solar panels, it is also still transmitting. Tilley says it is still sending out 100 bits per second of data, data analysts believe likely describes the satellite’s health. LES-5 might even be the oldest functioning geostationary satellite in space.
Military communications satellites paved the way for the civilian satellite communications we use every day. If a museum of famous and influential satellites were ever created, the LES family of sats would almost certainly deserve prominent placement.
You can track LES-5's location here.
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