NASA loses contact with ICON atmosphere-studying satellite in Earth orbit

satellite in orbit with aurora in behind
An artist's view of NASA's Ionospheric Connection Explorer, or ICON, satellite. (Image credit: NASA)

NASA recently lost contact with an atmosphere-studying satellite working beyond its design lifetime.

NASA's Ionospheric Connection Explorer (ICON) fell out of contact on Nov. 25, and the mission team has not been able to hail the spacecraft in the weeks since, agency officials wrote in a brief statement (opens in new tab) on Wednesday (Dec. 7).

"The team is currently still working to establish a connection," NASA officials wrote. "Working with the Department of Defense's Space Surveillance Network, the team has verified that ICON remains intact."

In pictures: NASA's Ionospheric Connection Explorer satellite mission

ICON's hardware includes a "command loss timer" designed to reset the spacecraft if it doesn't talk to ground controllers for eight days. But the spacecraft remains silent after the reset completed on Monday (Dec. 5), NASA added in the blog post.

ICON, which launched in October 2019, is exploring facets of Earth's ionosphere that other spacecraft have not looked for before. The ionosphere — a layer of Earth's atmosphere that stretches from roughly 50 miles to 400 miles (80 to 640 kilometers) above our planet — changes constantly with solar radiation. Such variations can affect communications technologies.

The mission passed its two-year prime mission in December 2021 and is working under an extended mission.

Troubleshooting continues, as the mission team explores the probable source of the issue to "problems within the avionics or radio-frequency communications subsystems," NASA officials added.

It is unclear right now whether the spacecraft will call home again, the blog post noted. "The team is currently unable to determine the health of the spacecraft, and the lack of a downlink signal could be indicative of a system failure."

Elizabeth Howell is the co-author of "Why Am I Taller (opens in new tab)?" (ECW Press, 2022; with Canadian astronaut Dave Williams), a book about space medicine. Follow her on Twitter @howellspace (opens in new tab). Follow us on Twitter @Spacedotcom (opens in new tab) or Facebook (opens in new tab).

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell, Ph.D., is a staff writer in the spaceflight channel since 2022. She was contributing writer for (opens in new tab) for 10 years before that, since 2012. Elizabeth's reporting includes an exclusive with Office of the Vice-President of the United States, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and (soon) a Bachelor of History from Athabasca University. Elizabeth is also a post-secondary instructor in communications and science since 2015. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: