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🛰️ SATELLITE · HISTORICAL RECORD

DOS 7K No. 7

Re-entered 23 Mar 2001

DOS 7K No. 7 (NORAD 16609, COSPAR 1986-017A) was a SU satellite that re-entered Earth's atmosphere on 23 Mar 2001, launched on 19 Feb 1986 on the DOS 7 (17K No. 127-01) mission. It was operated by NPOE as part of the DOS programme. The spacecraft was built by ZIKH on the Almaz bus, with a mass of 20,100 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.

1986
launched
2001
re-entered
15
years on orbit
20,100
kg mass

Lifecycle

Launched19 Feb 1986 · on the DOS 7 (17K No. 127-01) mission
Operational23 Mar 2001 · entered service
Retired23 Mar 2001 · end of operational service
Re-entered23 Mar 2001 · atmospheric re-entry — object destroyed

Specifications

NORAD ID16609
COSPAR1986-017A
TypeSatellite
OperatorNPOE
Country / StateSU
ManufacturerZIKH
BusAlmaz
Mass20,100 kg
ProgrammeDOS
CategorySS
OrbitLEO (LLEO/I)
Altitude332 × 338 km
Inclination51.6°

Frequently asked questions

What happened to DOS 7K No. 7?

DOS 7K No. 7 re-entered Earth's atmosphere on 23 Mar 2001, ending a mission that began with its launch in 1986. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did DOS 7K No. 7 re-enter the atmosphere?

DOS 7K No. 7 re-entered on 23 Mar 2001, according to Orbital Radar's historical catalogue records.

Who operated and built DOS 7K No. 7?

DOS 7K No. 7 was operated by NPOE and built by ZIKH (SU).

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