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🛰️ SATELLITE · HISTORICAL RECORD

SEO

Re-entered 17 Feb 1989

SEO (NORAD 11392, COSPAR 1979-051A) was a IN satellite that re-entered Earth's atmosphere on 17 Feb 1989, launched on 7 Jun 1979 on the SEO mission. It was operated by ISRO as part of the ISRO programme. The spacecraft was built by ISRO on the ISRO SEO bus, with a mass of 425 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.

1979
launched
1989
re-entered
10
years on orbit
425
kg mass

Lifecycle

Launched7 Jun 1979 · on the SEO mission
Operational1 Aug 1981 · entered service
Retired1 Aug 1981 · end of operational service
Re-entered17 Feb 1989 · atmospheric re-entry — object destroyed

Specifications

NORAD ID11392
COSPAR1979-051A
TypeSatellite
OperatorISRO
Country / StateIN
ManufacturerISRO
BusISRO SEO
Mass425 kg
ProgrammeISRO
CategoryIMG
OrbitLEO (LLEO/I)
Altitude518 × 540 km
Inclination50.7°

Frequently asked questions

What happened to SEO?

SEO re-entered Earth's atmosphere on 17 Feb 1989, ending a mission that began with its launch in 1979. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did SEO re-enter the atmosphere?

SEO re-entered on 17 Feb 1989, according to Orbital Radar's historical catalogue records.

Who operated and built SEO?

SEO was operated by ISRO and built by ISRO (IN).

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