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🛰️ SATELLITE · HISTORICAL RECORD

77KST No. 172-01

Re-entered 10 Jun 1990

77KST No. 172-01 (NORAD 20635, COSPAR 1990-048A) was a SU satellite that re-entered Earth's atmosphere on 10 Jun 1990, launched on 31 May 1990 on the TsM-T 77KST No. 17201 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 19,500 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.

1990
launched
1990
re-entered
0
years on orbit
19,500
kg mass

Lifecycle

Launched31 May 1990 · on the TsM-T 77KST No. 17201 mission
Operational23 Mar 2001 · entered service
Retired23 Mar 2001 · end of operational service
Re-entered10 Jun 1990 · atmospheric re-entry — object destroyed

Specifications

NORAD ID20635
COSPAR1990-048A
TypeSatellite
OperatorNPOE
Country / StateSU
ManufacturerZIKH
Bus77KS
Mass19,500 kg
ProgrammeTsM
CategorySS
OrbitLEO (LLEO/I)
Altitude373 × 388 km
Inclination51.6°

Frequently asked questions

What happened to 77KST No. 172-01?

77KST No. 172-01 re-entered Earth's atmosphere on 10 Jun 1990, ending a mission that began with its launch in 1990. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did 77KST No. 172-01 re-enter the atmosphere?

77KST No. 172-01 re-entered on 10 Jun 1990, according to Orbital Radar's historical catalogue records.

Who operated and built 77KST No. 172-01?

77KST No. 172-01 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.