|Launch site||Submarine "Borisoglebsk," stationed in the Barents Sea, Russia|
|Cause||Inadequate control software|
|Payload||Cosmos 1 (solar sail test capsule)|
|Desired orbit||n/a (suborbital flight)|
The spacecraft and rocket likely burnt up in the atmosphere upon re-entry or crashed on Russia's Kamchatka Peninsula, officials said.
The separation command was not issued by the flight software because of the presence of "dynamic variations," which however would not have affected the Cosmos 1 test spacecraft performance or its recovery.