HomeLibraryRe-entered Satellites77KSD No. 171-01
🛰️ SATELLITE · HISTORICAL RECORD

77KSD No. 171-01

Re-entered 6 Dec 1989

77KSD No. 171-01 (NORAD 20335, COSPAR 1989-093A) was a SU satellite that re-entered Earth's atmosphere on 6 Dec 1989, launched on 26 Nov 1989 on the TsM-D mission. It was operated by NPOE as part of the TsM programme. The spacecraft was built by ZIKH on the 77KS bus, with a mass of 23,500 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.

1989
launched
1989
re-entered
0
years on orbit
23,500
kg mass

Lifecycle

Launched26 Nov 1989 · on the TsM-D mission
Operational23 Mar 2001 · entered service
Retired23 Mar 2001 · end of operational service
Re-entered6 Dec 1989 · atmospheric re-entry — object destroyed

Specifications

NORAD ID20335
COSPAR1989-093A
TypeSatellite
OperatorNPOE
Country / StateSU
ManufacturerZIKH
Bus77KS
Mass23,500 kg
ProgrammeTsM
CategorySS
OrbitLEO (LLEO/I)
Altitude390 × 393 km
Inclination51.6°

Frequently asked questions

What happened to 77KSD No. 171-01?

77KSD No. 171-01 re-entered Earth's atmosphere on 6 Dec 1989, ending a mission that began with its launch in 1989. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did 77KSD No. 171-01 re-enter the atmosphere?

77KSD No. 171-01 re-entered on 6 Dec 1989, according to Orbital Radar's historical catalogue records.

Who operated and built 77KSD No. 171-01?

77KSD No. 171-01 was operated by NPOE and built by ZIKH (SU).

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