HomeLibraryRe-entered SatellitesIS-M No. 525-10-023
🛰️ SATELLITE · HISTORICAL RECORD

IS-M No. 525-10-023

Re-entered 26 Oct 1977

IS-M No. 525-10-023 (NORAD 10434, COSPAR 1977-104A) was a SU satellite that re-entered Earth's atmosphere on 26 Oct 1977, launched on 26 Oct 1977 on the IS mission. It was operated by PKO as part of the IS 5V91TM programme. The spacecraft was built by KOMET on the IS bus, with a mass of 1,400 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.

1977
launched
1977
re-entered
0
years on orbit
1,400
kg mass

Lifecycle

Launched26 Oct 1977 · on the IS mission
Operational26 Oct 1977 · entered service
Retired26 Oct 1977 · end of operational service
Re-entered26 Oct 1977 · atmospheric re-entry — object destroyed

Specifications

NORAD ID10434
COSPAR1977-104A
TypeSatellite
OperatorPKO
Country / StateSU
ManufacturerKOMET
BusIS
Mass1,400 kg
ProgrammeIS 5V91TM
CategoryWEAPON
OrbitLEO (LLEO/I)
Altitude125 × 302 km
Inclination66.0°

Frequently asked questions

What happened to IS-M No. 525-10-023?

IS-M No. 525-10-023 re-entered Earth's atmosphere on 26 Oct 1977, ending a mission that began with its launch in 1977. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did IS-M No. 525-10-023 re-enter the atmosphere?

IS-M No. 525-10-023 re-entered on 26 Oct 1977, according to Orbital Radar's historical catalogue records.

Who operated and built IS-M No. 525-10-023?

IS-M No. 525-10-023 was operated by PKO and built by KOMET (SU).

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