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🛰️ SATELLITE · HISTORICAL RECORD

Rotor No. 50L

Re-entered 23 Jun 1973

Rotor No. 50L (NORAD 6684, COSPAR 1973-038A) was a SU satellite that re-entered Earth's atmosphere on 23 Jun 1973, launched on 10 Jun 1973 on the Zenit-4M mission. It was operated by GUKOSR as part of the Zenit-4M programme. The spacecraft was built by TSKBE3 on the Zenit-4M bus, with a mass of 2,200 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.

1973
launched
1973
re-entered
0
years on orbit
2,200
kg mass

Lifecycle

Launched10 Jun 1973 · on the Zenit-4M mission
Operational23 Jun 1973 · entered service
Retired23 Jun 1973 · end of operational service
Re-entered23 Jun 1973 · atmospheric re-entry — object destroyed

Specifications

NORAD ID6684
COSPAR1973-038A
TypeSatellite
OperatorGUKOSR
Country / StateSU
ManufacturerTSKBE3
BusZenit-4M
Mass2,200 kg
ProgrammeZenit-4M
CategoryIMG
OrbitLEO (LLEO/I)
Altitude174 × 280 km
Inclination51.8°

Frequently asked questions

What happened to Rotor No. 50L?

Rotor No. 50L re-entered Earth's atmosphere on 23 Jun 1973, ending a mission that began with its launch in 1973. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did Rotor No. 50L re-enter the atmosphere?

Rotor No. 50L re-entered on 23 Jun 1973, according to Orbital Radar's historical catalogue records.

Who operated and built Rotor No. 50L?

Rotor No. 50L was operated by GUKOSR and built by TSKBE3 (SU).

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