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Soyuz 7K-STM No. 51

Re-entered 23 May 1986

Soyuz 7K-STM No. 51 (NORAD 16722, COSPAR 1986-035A) was a SU satellite that re-entered Earth's atmosphere on 23 May 1986, launched on 21 May 1986 on the Soyuz 7K-STM No. 51 mission. It was operated by NPOE as part of the 7K-STM programme. The spacecraft was built by NPOE on the 7K-STM bus, with a mass of 2,850 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.

1986
launched
1986
re-entered
0
years on orbit
2,850
kg mass

Lifecycle

Launched21 May 1986 · on the Soyuz 7K-STM No. 51 mission
Operational30 May 1986 · entered service
Retired30 May 1986 · end of operational service
Re-entered23 May 1986 · atmospheric re-entry — object destroyed

Specifications

NORAD ID16722
COSPAR1986-035A
TypeSatellite
OperatorNPOE
Country / StateSU
ManufacturerNPOE
Bus7K-STM
Mass2,850 kg
Programme7K-STM
CategorySS
OrbitLEO (LLEO/I)
Altitude341 × 357 km
Inclination51.6°

Frequently asked questions

What happened to Soyuz 7K-STM No. 51?

Soyuz 7K-STM No. 51 re-entered Earth's atmosphere on 23 May 1986, ending a mission that began with its launch in 1986. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did Soyuz 7K-STM No. 51 re-enter the atmosphere?

Soyuz 7K-STM No. 51 re-entered on 23 May 1986, according to Orbital Radar's historical catalogue records.

Who operated and built Soyuz 7K-STM No. 51?

Soyuz 7K-STM No. 51 was operated by NPOE and built by NPOE (SU).

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