The Soyuz 2

Soyuz 2 was an unpiloted spacecraft in
the Soyuz family intended toperform
a docking maneuver with Soyuz 3.
Although the two craft approached,
closely, the docking did not take place.

Salyut 2 (OPS-1)(Russian:Салют-2; English translation: Salute 2) was launched April 4, 1973. It was not really a part of the same program as the other Salyut space stations, instead being the highly classified prototype military space station Almaz. It was given the designation Salyut 2 to conceal its true nature. Despite its successful launch, within two days the as-yet-unmanned Salyut 2 began losing pressure and its flight control failed; the cause of the failure was likely due to shrapnel piercing the station when the discarded Proton rocket upper stage that had placed it in orbit later exploded nearby. On April 11, 1973, 11 days after launch, an unexplainable accident caused the two large solar panels to be torn loose from the space station cutting off all power to the space station. Salyut 2 re-entered on May 28, 1973.
Station statistics
Call sign: Salyut 2
Crew: 3
Launch: April 4, 1973 09:00:00 UTC
Launch pad: Baikonur Cosmodrome, USSR
Reentry: May 28, 1973
Mass: 18,500 kg
Length: 14.55 m
Width: 4.15 m
Living volume: 99 m³
Perigee: 257 km (138.8 nmi)
Apogee: 278 km (150.1 nmi)
Orbit inclination: 51.6 degrees
Orbital period: 89.8 minutes
Days in orbit: 54 days
Days occupied: 0 days
Number of orbits: 866
Distance travelled: 35,163,530 km(18,986,787.3 nmi)