| Progress 4 | |||||||||||
| Mission Type: | Salyut 6 resupply | ||||||||||
| Operator: | OKB-1 | ||||||||||
| Cospar Id: | 1978-090A | ||||||||||
| Satcat: | 11040 [1] | ||||||||||
| Mission Duration: | 23 days | ||||||||||
| Spacecraft: | Progress s/n 105 | ||||||||||
| Spacecraft Type: | Progress 7K-TG | ||||||||||
| Manufacturer: | NPO Energia | ||||||||||
| Launch Mass: | 7281 kg | ||||||||||
| Dry Mass: | 7020 kg | ||||||||||
| Payload Mass: | 2436 kg | ||||||||||
| Dimensions: | 7.48 m in length and 2.72 m in diameter | ||||||||||
| Launch Date: | 3 October 1978, 23:09:30 UTC | ||||||||||
| Launch Rocket: | Soyuz-U s/n Ye15000-152 | ||||||||||
| Launch Site: | Baikonur, 1/5 | ||||||||||
| Launch Contractor: | OKB-1 | ||||||||||
| Disposal Type: | Deorbited | ||||||||||
| Decay Date: | 26 October 1978, 16:28 UTC [2] | ||||||||||
| Docking: |
| ||||||||||
| Orbit Epoch: | 3 October 1978 | ||||||||||
| Orbit Reference: | Geocentric | ||||||||||
| Orbit Regime: | Low Earth | ||||||||||
| Orbit Periapsis: | 191 km | ||||||||||
| Orbit Apoapsis: | 266 km | ||||||||||
| Orbit Inclination: | 51.66° | ||||||||||
| Orbit Period: | 88.8 minutes | ||||||||||
| Apsis: | gee | ||||||||||
| Cargo Mass: | 2436 kg | ||||||||||
| Cargo Mass Press: | 1230 kg | ||||||||||
| Cargo Mass Fuel: | 705 kg | ||||||||||
| Cargo Mass Gas: | 50 kg | ||||||||||
| Cargo Mass Water: | 420 kg | ||||||||||
| Programme: | Progress (spacecraft) | ||||||||||
| Previous Mission: | Progress 3 | ||||||||||
| Next Mission: | Progress 5 | ||||||||||
Progress 4, was a 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 fourth Progress mission to Salyut 6. It carried supplies aboard Salyut 6, as well as equipment for conducting scientific research, and fuel for adjusting the station's orbit and performing manoeuvres.
Progress 4 was a Progress 7K-TG spacecraft. The fourth of forty three to be launched, it had the serial number 105.[4] [5] 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, which increased to around when fully fuelled. It measured in length, and in diameter. Each spacecraft could accommodate up to 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.[6]
Progress 4 launched on 3 October 1978 at 23:09:30 UTC from the Baikonur Cosmodrome in the Kazakh Soviet Socialist Republic. It used a Soyuz-U rocket.[4]
Progress 4 docked with Salyut 6 on 6 October 1978 at 01:00:15 UTC.[7]
It remained in orbit until 26 October 1978, when it was deorbited. The deorbit burn occurred at 16:28 UTC.