Zenit-6 No. 4L

Re-entered 9 Aug 1977

Zenit-6 No. 4L (NORAD 10164, COSPAR 1977-072A) was a SU satellite that re-entered Earth's atmosphere on 9 Aug 1977, launched on 27 Jul 1977 on the Zenit-6 mission. It was operated by GUKOSR as part of the Zenit-6 programme. The spacecraft was built by TSSKB on the Zenit-6 bus, with a mass of 2,655 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

years on orbit

2,655

kg mass

Lifecycle

Launched27 Jul 1977 · on the Zenit-6 mission

Operational9 Aug 1977 · entered service

Retired9 Aug 1977 · end of operational service

Re-entered9 Aug 1977 · atmospheric re-entry — object destroyed

Specifications

NORAD ID10164

COSPAR1977-072A

TypeSatellite

OperatorGUKOSR

Country / StateSU

ManufacturerTSSKB

BusZenit-6

Mass2,655 kg

ProgrammeZenit-6

CategoryIMG

OrbitLEO (LLEO/I)

Altitude166 × 341 km

Inclination62.8°

Frequently asked questions

What happened to Zenit-6 No. 4L?

Zenit-6 No. 4L re-entered Earth's atmosphere on 9 Aug 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 Zenit-6 No. 4L re-enter the atmosphere?

Zenit-6 No. 4L re-entered on 9 Aug 1977, according to Orbital Radar's historical catalogue records.

Who operated and built Zenit-6 No. 4L?

Zenit-6 No. 4L was operated by GUKOSR and built by TSSKB (SU).

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

Browse the live satellite directory → Re-entered satellites archive → Launch record: Zenit-6 → What is space debris? →