Progress 2
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 | |
| Mission type | Salyut 6 resupply |
|---|---|
| Operator | OKB-1 |
| COSPAR ID | 1978-070A |
| SATCAT no. | 10979 |
| Mission duration | 27 days, 14 hours and 49 minutes |
| Spacecraft properties | |
| Spacecraft | Progress s/n 101 |
| Spacecraft type | Progress 7K-TG |
| Manufacturer | NPO Energia |
| Launch mass | 7020 kg |
| Dry mass | 6520 kg |
| Payload mass | 2500 kg |
| Dimensions | 7.48 m in length and 2.72 m in diameter |
| Start of mission | |
| Launch date | 7 July 1978, 11:26:16 UTC |
| Rocket | Soyuz-U s/n S15000-128 |
| Launch site | Baikonur, Site 31/6 |
| Contractor | OKB-1 |
| End of mission | |
| Disposal | Deorbited |
| Decay date | 4 August 1978, 02:15 UTC |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 193 km |
| Apogee altitude | 262 km |
| Inclination | 51.66° |
| Period | 88.7 minutes |
| Epoch | 7 July 1978 |
| Docking with Salyut 6 | |
| Docking port | Aft |
| Docking date | 9 July 1978, 12:58:59 UTC |
| Undocking date | 2 August 1978, 04:57:44 UTC |
| Time docked | 23 days, 15 hours and 59 minutes |
| Cargo | |
| Mass | 2500 kg |
| Fuel | 600 kg |
Progress 2 (Russian: Прогресс 2) was an unmanned Progress cargo spacecraft launched by the Soviet Union in 1978 to resupply the Salyut 6 space station. It used the Progress 7K-TG configuration, and was the second Progress mission to Salyut 6. It carried supplies for the EO-2 crew aboard Salyut 6, as well as equipment for conducting scientific research, and fuel for adjusting the station's orbit and performing manoeuvres.
Progress 2 was a Progress 7K-TG spacecraft. The second of forty three to be launched, it had the serial number 101.[1][2] The Progress 7K-TG spacecraft was the first generation Progress, derived from the Soyuz 7K-T and intended for unmanned logistics missions to space stations in support of the Salyut programme.[3] On some missions the spacecraft were also used to adjust the orbit of the space station.[4]
The Progress spacecraft had a dry mass of 6,520 kilograms (14,370 lb), which increased to around 7,020 kilograms (15,480 lb) when fully fuelled. It measured 7.48 metres (24.5 ft) in length, and 2.72 metres (8 ft 11 in) in diameter. Each spacecraft could accommodate up to 2,500 kilograms (5,500 lb) 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.[3][4]
Launch and docking
Progress 2 was launched at 11:26:16 UTC on 7 July 1978, atop a Soyuz-U 11A511U carrier rocket flying from Site 31/6 at the Baikonur Cosmodrome in the Kazakh Soviet Socialist Republic. The rocket that launched it had the serial number S15000-128.[5] Following launch, Progress 2 was given the COSPAR designation 1978-070A, whilst NORAD assigned it the Satellite Catalog Number 10979.[6]
Following launch, Progress 2 began two days of free flight. It subsequently docked with the aft port of the Salyut 6 space station at 12:58:59 UTC on 9 July.[3][7] At the time of its docking, Soyuz 29 was docked to the forward port of the station. Soyuz 29 remained docked throughout the time Progress 2 was docked.[8]
