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🛰️ SATELLITE · HISTORICAL RECORD

LOSAT-X

Re-entered 15 Nov 1991

LOSAT-X (NORAD 21553, COSPAR 1991-047B) was a US satellite that re-entered Earth's atmosphere on 15 Nov 1991, launched on 4 Jul 1991 on the Navstar GPS SVN 24 mission. It was operated by SDIO as part of the SDIO SS programme. The spacecraft was built by BALL on the Quickstar bus, with a mass of 75 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.

1991
launched
1991
re-entered
0
years on orbit
75
kg mass

Lifecycle

Launched4 Jul 1991 · on the Navstar GPS SVN 24 mission
Operational13 Jul 1991 · entered service
Retired13 Jul 1991 · end of operational service
Re-entered15 Nov 1991 · atmospheric re-entry — object destroyed

Specifications

NORAD ID21553
COSPAR1991-047B
TypeSatellite
OperatorSDIO
Country / StateUS
ManufacturerBALL
BusQuickstar
Mass75 kg
ProgrammeSDIO SS
CategoryEW/TECH
OrbitLEO (LLEO/I)
Altitude387 × 401 km
Inclination40.0°

Frequently asked questions

What happened to LOSAT-X?

LOSAT-X re-entered Earth's atmosphere on 15 Nov 1991, ending a mission that began with its launch in 1991. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did LOSAT-X re-enter the atmosphere?

LOSAT-X re-entered on 15 Nov 1991, according to Orbital Radar's historical catalogue records.

Who operated and built LOSAT-X?

LOSAT-X was operated by SDIO and built by BALL (US).

Launched together

GPS SVN 24NORAD 21552
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.