Soyuz 7K-STM No. 63

Re-entered 4 Oct 1991

Soyuz 7K-STM No. 63 (NORAD 21735, COSPAR 1991-069A) was a SU satellite that re-entered Earth's atmosphere on 4 Oct 1991, launched on 2 Oct 1991 on the Soyuz 7K-STM No. 63 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.

1991

launched

1991

re-entered

years on orbit

2,850

kg mass

Lifecycle

Launched2 Oct 1991 · on the Soyuz 7K-STM No. 63 mission

Operational25 Mar 1992 · entered service

Retired25 Mar 1992 · end of operational service

Re-entered4 Oct 1991 · atmospheric re-entry — object destroyed

Specifications

NORAD ID21735

COSPAR1991-069A

TypeSatellite

OperatorNPOE

Country / StateSU

ManufacturerNPOE

Bus7K-STM

Mass2,850 kg

Programme7K-STM

CategorySS

OrbitLEO (LLEO/I)

Altitude390 × 399 km

Inclination51.6°

Frequently asked questions

What happened to Soyuz 7K-STM No. 63?

Soyuz 7K-STM No. 63 re-entered Earth's atmosphere on 4 Oct 1991, ending a mission that began with its launch in 1991. 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. 63 re-enter the atmosphere?

Soyuz 7K-STM No. 63 re-entered on 4 Oct 1991, according to Orbital Radar's historical catalogue records.

Who operated and built Soyuz 7K-STM No. 63?

Soyuz 7K-STM No. 63 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.

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