Oko 73D6 No. 6021

Re-entered 7 May 2001

Oko 73D6 No. 6021 (NORAD 15027, COSPAR 1984-055A) was a SU satellite that re-entered Earth's atmosphere on 7 May 2001, launched on 6 Jun 1984 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.

1984

launched

2001

re-entered

years on orbit

1,250

kg mass

Lifecycle

Launched6 Jun 1984 · on the Oko mission

Operational10 Feb 1986 · entered service

Retired10 Feb 1986 · end of operational service

Re-entered7 May 2001 · atmospheric re-entry — object destroyed

Specifications

NORAD ID15027

COSPAR1984-055A

TypeSatellite

OperatorPVO

Country / StateSU

ManufacturerNPOL/KOMET

BusOko

Mass1,250 kg (1,150 kg dry)

ProgrammeOko E

CategoryEW

OrbitHEO (HEO/M)

Altitude612 × 39,748 km

Inclination63.0°

Frequently asked questions

What happened to Oko 73D6 No. 6021?

Oko 73D6 No. 6021 re-entered Earth's atmosphere on 7 May 2001, ending a mission that began with its launch in 1984. 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. 6021 re-enter the atmosphere?

Oko 73D6 No. 6021 re-entered on 7 May 2001, according to Orbital Radar's historical catalogue records.

Who operated and built Oko 73D6 No. 6021?

Oko 73D6 No. 6021 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? →