Oko 73D6 No. 6031

Re-entered 12 Nov 2005

Oko 73D6 No. 6031 (NORAD 15808, COSPAR 1985-045A) was a SU satellite that re-entered Earth's atmosphere on 12 Nov 2005, launched on 11 Jun 1985 on the Oko mission. It was operated by PVO as part of the Oko E programme. The spacecraft was built by NPOL/KOMET on the Oko bus, with a mass of 1,250 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.

1985

launched

2005

re-entered

years on orbit

1,250

kg mass

Lifecycle

Launched11 Jun 1985 · on the Oko mission

Operational10 Jun 1987 · entered service

Retired10 Jun 1987 · end of operational service

Re-entered12 Nov 2005 · atmospheric re-entry — object destroyed

Specifications

NORAD ID15808

COSPAR1985-045A

TypeSatellite

OperatorPVO

Country / StateSU

ManufacturerNPOL/KOMET

BusOko

Mass1,250 kg (1,150 kg dry)

ProgrammeOko E

CategoryEW

OrbitHEO (HEO/M)

Altitude629 × 39,726 km

Inclination63.1°

Frequently asked questions

What happened to Oko 73D6 No. 6031?

Oko 73D6 No. 6031 re-entered Earth's atmosphere on 12 Nov 2005, ending a mission that began with its launch in 1985. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did Oko 73D6 No. 6031 re-enter the atmosphere?

Oko 73D6 No. 6031 re-entered on 12 Nov 2005, according to Orbital Radar's historical catalogue records.

Who operated and built Oko 73D6 No. 6031?

Oko 73D6 No. 6031 was operated by PVO and built by NPOL/KOMET (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: Oko → What is space debris? →