Oko 63D6 No. 5009

Re-entered 21 Jan 2008

Oko 63D6 No. 5009 (NORAD 20941, COSPAR 1990-099A) was a SU satellite that re-entered Earth's atmosphere on 21 Jan 2008, launched on 20 Nov 1990 on the Oko mission. It was operated by PVO as part of the Oko C 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.

1990

launched

2008

re-entered

years on orbit

1,250

kg mass

Lifecycle

Launched20 Nov 1990 · on the Oko mission

Operational4 Apr 1993 · entered service

Retired4 Apr 1993 · end of operational service

Re-entered21 Jan 2008 · atmospheric re-entry — object destroyed

Specifications

NORAD ID20941

COSPAR1990-099A

TypeSatellite

OperatorPVO

Country / StateSU

ManufacturerNPOL/KOMET

BusOko

Mass1,250 kg (1,150 kg dry)

ProgrammeOko C

CategoryEW

OrbitHEO (HEO/M)

Altitude595 × 39,751 km

Inclination63.3°

Frequently asked questions

What happened to Oko 63D6 No. 5009?

Oko 63D6 No. 5009 re-entered Earth's atmosphere on 21 Jan 2008, ending a mission that began with its launch in 1990. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did Oko 63D6 No. 5009 re-enter the atmosphere?

Oko 63D6 No. 5009 re-entered on 21 Jan 2008, according to Orbital Radar's historical catalogue records.

Who operated and built Oko 63D6 No. 5009?

Oko 63D6 No. 5009 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? →