CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1977-0090
SALYUT 4
SALYUT 4 (NORAD 7591) was deorbited in a controlled re-entry on 2 February 1977, after 2 years, 1 month in orbit.
Controlled re-entryOfficial date
NORAD number
7591
International designator
1974-104A
Object type
Spacecraft
Country
USSR
Launched
26 Dec 1974Baikonur Cosmodrome
Re-entered (UTC)
2 Feb 1977UTC calendar day
Time in orbit
2 years, 1 month769 days
How it ended
Deorbited (controlled re-entry)
Latitude range
51.6°N to 51.6°SFinal inclination 51.6°
Mass
18,500 kg
Operator
NPO Energiya
Built by
ZIKh
Bus
Almaz
Programme
DOS
Where it came down
Latitude band its orbit allowedExact position not recorded
No position was recorded for this re-entry. Its final orbit, inclined at 51.6°, allowed a re-entry anywhere between 51.6°N and 51.6°S.
Life in orbit
2 years, 1 monthSALYUT 4’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1974-104
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1977-0090
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1977-0090
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.