a low Earth orbit with a perigee of and an apogee of , inclined at 51.66° and with a period of 91.1 minutes. Progress 2 undocked from Salyut 6 at 04:57:44 UTC on 2 August. It remained in orbit until the early morning of 4 August 1978, when it was deorbited. The deorbit burn occurred at 01:31:07 UTC, with the spacecraft undergoing a destructive reentry at around 02:15 UTC. Less than four days after Progress 2 had been deorbited, Progress 3 was launched to replace it. See also 1978 in spaceflight List of Progress missions List of uncrewed spaceflights to Salyut space stations References {{Progress (spacecraft)}} 1978 in the Soviet Union Progress (spacecraft) missions Spacecraft launched in 1978 Spacecraft which reentered in 1978 Spacecraft launched by Soyuz-U rockets