SEO B

Re-entered 30 Nov 1991

SEO B (NORAD 12968, COSPAR 1981-115A) was a IN satellite that re-entered Earth's atmosphere on 30 Nov 1991, launched on 20 Nov 1981 on the SEO B mission. It was operated by ISRO as part of the ISRO programme. The spacecraft was built by ISRO on the ISS 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.

1981

launched

1991

re-entered

years on orbit

425

kg mass

Lifecycle

Launched20 Nov 1981 · on the SEO B mission

Operational1 Apr 1984 · entered service

Retired1 Apr 1984 · end of operational service

Re-entered30 Nov 1991 · atmospheric re-entry — object destroyed

Specifications

NORAD ID12968

COSPAR1981-115A

TypeSatellite

OperatorISRO

Country / StateIN

ManufacturerISRO

BusISS SEO

Mass425 kg

ProgrammeISRO

CategoryIMG

OrbitLEO (LLEO/I)

Altitude438 × 448 km

Inclination50.7°

Frequently asked questions

What happened to SEO B?

SEO B re-entered Earth's atmosphere on 30 Nov 1991, ending a mission that began with its launch in 1981. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did SEO B re-enter the atmosphere?

SEO B re-entered on 30 Nov 1991, according to Orbital Radar's historical catalogue records.

Who operated and built SEO B?

SEO B 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.

Browse the live satellite directory → Re-entered satellites archive → Launch record: SEO B → What is space debris? →