CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1977-0358
SL-4 R/B
SL-4 R/B (NORAD 10173) re-entered Earth’s atmosphere on 28 August 1977, after 25 days in orbit.
Official date
NORAD number
10173
International designator
1977-074B
Object type
Rocket body
Country
USSR
Launched
3 Aug 1977Plesetsk Cosmodrome
Re-entered (UTC)
28 Aug 1977UTC calendar day
Time in orbit
25 days25 days
How it ended
Re-entered (natural decay)
Latitude range
62.8°N to 62.8°SFinal inclination 62.8°
Mass
2,350 kg
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 62.8°, allowed a re-entry anywhere between 62.8°N and 62.8°S.
Life in orbit
25 daysSL-4 R/B’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1977-074
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1977-0358
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1977-0358
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.