[Scott Tilley] was searching for radio signals from the Air Force’s top-secret ZUMA satellite. He found something that is — we think — much more interesting. He found NASA’s lost satellite called IMAGE. You are probably wondering why it is interesting that someone listening for one satellite found another one. You see, NASA declared IMAGE dead in 2005. It went silent unexpectedly and did not complete its mission to image the magnetosphere.

NASA did a failure review and concluded that in all likelihood a single event upset caused a power controller to trip. A single event upset, or SEU, is a radiation event and should have been automatically recovered. However, there was a design flaw that failed to report certain types of power controller failures, including this one.

The report mentioned that it might be possible to reset the controller at a specific time in 2007, but given that NASA thought the satellite was out of commission that either never occurred or didn’t work. However, something apparently woke the satellite up from its sleep.

[Scott] did a lot of number crunching to determine that the satellite’s spin rate had only decreased a little from its operational value and that the doppler data matched what he expected. [Scott] can’t read or command the telemetry, so he doesn’t know how healthy the satellite is, but it is at least operational to some degree. It’s really neat to see members of the team that worked on IMAGE leaving comments congratulating [Scott] on the find. They are working to get him data formatting information to see if more sense can be made of the incoming transmissions.

Who knew listening to satellites could be so exciting? If you want to build your own ground station, you might be interested in this antenna mount. If you need to know what’s overhead, this can help.