US-PM (Upravlenniye Sputnik Passivny Modifikirovanny) (also reported as US-PU) was a solar powered improved EORSAT (Electronic Ocean Reconnaissance Satellite). It used an passive ELINT devices to track naval vessels from space by registering their electronic emmissions.

Mission type: Government/Top Secret · Orbit: Low Earth Orbit

Rocket: Tsiklon-2 · Provider: Russian Federal Space Agency (ROSCOSMOS)