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🛰️ SATELLITE · HISTORICAL RECORD

ER-763-4

Re-entered 23 Mar 1980

ER-763-4 (NORAD 9938, COSPAR 1977-031A) was a SU satellite that re-entered Earth's atmosphere on 23 Mar 1980, launched on 27 Apr 1977 on the ER763-4 mission. It was operated by GUKOSR as part of the Signe GVM programme. The spacecraft was built by OAZ? on the ER763-4 bus, with a mass of 100 kg. Like most satellites in low orbits, it was gradually slowed by atmospheric drag until re-entry. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.

1977
launched
1980
re-entered
3
years on orbit
100
kg mass

Lifecycle

Launched27 Apr 1977 · on the ER763-4 mission
Operational27 Apr 1977 · entered service
Retired27 Apr 1977 · end of operational service
Re-entered23 Mar 1980 · atmospheric re-entry — object destroyed

Specifications

NORAD ID9938
COSPAR1977-031A
TypeSatellite
OperatorGUKOSR
Country / StateSU
ManufacturerOAZ?
BusER763-4
Mass100 kg
ProgrammeSigne GVM
CategoryTECH
OrbitLEO (LLEO/I)
Altitude463 × 513 km
Inclination50.6°

Frequently asked questions

What happened to ER-763-4?

ER-763-4 re-entered Earth's atmosphere on 23 Mar 1980, ending a mission that began with its launch in 1977. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did ER-763-4 re-enter the atmosphere?

ER-763-4 re-entered on 23 Mar 1980, according to Orbital Radar's historical catalogue records.

Who operated and built ER-763-4?

ER-763-4 was operated by GUKOSR and built by OAZ? (SU).

Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.