CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1978-0393
TETR 4
TETR 4 (NORAD 5492) re-entered Earth’s atmosphere on 19 September 1978, after 6 years, 11 months in orbit.
Official date
NORAD number
5492
International designator
1971-083B
Object type
Spacecraft
Country
United States
Launched
29 Sep 1971Cape Canaveral
Re-entered (UTC)
19 Sep 1978UTC calendar day
Time in orbit
6 years, 11 months2,547 days
How it ended
Re-entered (natural decay)
Latitude range
33.1°N to 33.1°SFinal inclination 33.1°
Mass
18 kg
Operator
GSFC
Built by
TRW
Bus
ORS
Programme
TTS
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 33.1°, allowed a re-entry anywhere between 33.1°N and 33.1°S.
Life in orbit
6 years, 11 monthsTETR 4’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 19 Sep 1978
2 entriesFrom the same launch
1971-083
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1978-0393
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1978-0393
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.