Kosmos 772

Kosmos 772 (Russian: Космос 772 meaning Cosmos 772) was an uncrewed military Soyuz 7K-S test. It was an unsuccessful mission as only one transmitter worked. Only the 166 MHz frequency transmitter operated, all of the other normal Soyuz wavelengths transmitters failed.^[1][2] The experience from these flights were used in the development of the successor program Soyuz spacecraft the Soyuz 7K-ST.^{[3][4][5][6][7][8]}

Kosmos 772

Mission type	Orbital test flight
Operator	Soviet space program
COSPAR ID	1975-093A
SATCAT no.	8338
Mission duration	3 days, 23 hours and 55 minutes
Spacecraft properties
Spacecraft type	Soyuz 7K-S s/n 2L
Manufacturer	NPO Energia
Launch mass	6,750 kg (14,880 lb)
Start of mission
Launch date	29 September 1975, 04:15 (1975-09-29UTC04:15Z) GMT
Rocket	Soyuz-U
Launch site	Baikonur 1/5
End of mission
Disposal	Deorbited
Landing date	3 October 1975, 04:10 (1975-10-03UTC04:11Z) GMT
Orbital parameters
Reference system	Geocentric
Perigee altitude	154 km (96 mi)
Apogee altitude	245 km (152 mi)
Inclination	51.8°
Period	88.4 min
Soyuz programme ← Soyuz 19 Soyuz 20 → Kosmos (satellites) ← Kosmos 771 Kosmos 773 →

Mission parameters

• Spacecraft: Soyuz 7K-S
• Mass: 6750 kg
• Crew: None
• Launched: September 29, 1975
• Landed: October 3, 1975 4:10 UTC
• Perigee: 154 km
• Apogee: 245 km
• Inclination: 51.8 deg
• Duration: 3.99 days

Maneuver Summary

• 193 km X 270 km orbit to 195 km X 300 km orbit. Delta V: 8 m/s.
• 196 km X 300 km orbit to 196 km X 328 km orbit. Delta V: 8 m/s.

Total Delta V: 16 m/s.

See also

• Spaceflight portal

• Cosmos 670
• Cosmos 869