Progress 11

Progress 11 (Прогресс 11) was a Soviet unmanned Progress cargo spacecraft, which was launched in September 1980 to resupply the Salyut 6 space station.

Spacecraft
Progress 11 was a Progress 7K-TG spacecraft. The eleventh of forty three to be launched, it had the serial number 111. The Progress 7K-TG spacecraft was the first generation Progress, derived from the Soyuz 7K-T and intended for uncrewed logistics missions to space stations in support of the Salyut programme. On some missions the spacecraft were also used to adjust the orbit of the space station.

The Progress spacecraft had a dry mass of 6520 kg, which increased to around 7020 kg when fully fuelled. It measured 7.48 m in length, and 2.72 m in diameter. Each spacecraft could accommodate up to 2500 kg of payload, consisting of dry cargo and propellant. The spacecraft were powered by chemical batteries, and could operate in free flight for up to three days, remaining docked to the station for up to thirty.

Launch
Progress 11 launched on 28 September 1980 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U rocket.

Docking
Progress 11 docked with the aft port of Salyut 6 on 30 September 1980 at 17:03 UTC, and was undocked on 9 December 1980 at 10:23 UTC.

Decay
It remained in orbit until 11 December 1980, when it was deorbited. The deorbit burn occurred at 14:00 UTC.