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Nauka 25KS No. 1L

Re-entered 2 Jul 1977

Nauka 25KS No. 1L (NORAD 10046, COSPAR 1977-043E) was a SU satellite that re-entered Earth's atmosphere on 2 Jul 1977, launched on 31 May 1977 on the Zenit-2M mission. It was operated by TSSKB as part of the Nauka 25KS programme. The spacecraft was built by TSSKB on the Nauka bus, with a mass of 630 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
630
kg mass

Lifecycle

Launched31 May 1977 · on the Zenit-2M mission
Operational12 Jun 1977 · entered service
Retired12 Jun 1977 · end of operational service
Re-entered2 Jul 1977 · atmospheric re-entry — object destroyed

Specifications

NORAD ID10046
COSPAR1977-043E
TypeSatellite
OperatorTSSKB
Country / StateSU
ManufacturerTSSKB
BusNauka
Mass630 kg
ProgrammeNauka 25KS
CategoryAST
OrbitLEO (LLEO/I)
Altitude200 × 291 km
Inclination65.0°

Frequently asked questions

What happened to Nauka 25KS No. 1L?

Nauka 25KS No. 1L re-entered Earth's atmosphere on 2 Jul 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 Nauka 25KS No. 1L re-enter the atmosphere?

Nauka 25KS No. 1L re-entered on 2 Jul 1977, according to Orbital Radar's historical catalogue records.

Who operated and built Nauka 25KS No. 1L?

Nauka 25KS No. 1L was operated by TSSKB and built by TSSKB (SU).

Launched together

Gektor No. 77LRe-entered 1977
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.