Progress 21

Progress 21 (Russian: Прогресс 21) was a Soviet uncrewed Progress cargo spacecraft, which was launched in May 1984 to resupply the Salyut 7 space station.

Progress 21

A Progress 7K-TG spacecraft
Mission type	Salyut 7 resupply
COSPAR ID	1984-042A
SATCAT no.	14961[1]
Spacecraft properties
Spacecraft	Progress (No.116)
Spacecraft type	Progress 7K-TG[2]
Manufacturer	NPO Energia
Start of mission
Launch date	7 May 1984, 22:47:15 UTC[1]
Rocket	Soyuz-U[2]
Launch site	Baikonur, Site 31/6
End of mission
Disposal	Deorbited
Decay date	26 May 1984, 15:00:30 UTC[3]
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Perigee altitude	187 km[3]
Apogee altitude	246 km[3]
Inclination	51.6°[3]
Period	88.8 minutes[3]
Epoch	26 May 1984
Docking with Salyut 7
Docking port	Aft[3]
Docking date	10 May 1984, 00:10 UTC
Undocking date	26 May 1984, 09:41 UTC
Progress (spacecraft) ← Progress 20 Progress 22 →

Launch

Progress 21 launched on 7 May 1984 from the Baikonur Cosmodrome in the Kazakh SSR. It used a Soyuz-U rocket.^[2][4]

Docking

Progress 21 docked with the aft port of Salyut 7 on 10 May 1984 at 00:10 UTC, and was undocked on 26 May 1984 at 09:41 UTC.^[3][5]

Decay

It remained in orbit until 26 May 1984, when it was deorbited. The deorbit burn occurred at 15:00:30 UTC, with the mission ending at around 15:45 UTC.^[3][5]

See also

• Spaceflight portal

• 1984 in spaceflight
• List of Progress missions
• List of uncrewed spaceflights to Salyut space stations