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🛰️ SATELLITE · HISTORICAL RECORD

ESRO 1B

Re-entered 23 Nov 1969

ESRO 1B (NORAD 4114, COSPAR 1969-083A) was a I-ESRO satellite that re-entered Earth's atmosphere on 23 Nov 1969, launched on 1 Oct 1969 on the ESRO 1B mission. It was operated by ESRO as part of the ESRO programme. The spacecraft was built by LCT on the ESRO 1 bus, with a mass of 85 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.

1969
launched
1969
re-entered
0
years on orbit
85
kg mass

Lifecycle

Launched1 Oct 1969 · on the ESRO 1B mission
Operational23 Nov 1969 · entered service
Retired23 Nov 1969 · end of operational service
Re-entered23 Nov 1969 · atmospheric re-entry — object destroyed

Specifications

NORAD ID4114
COSPAR1969-083A
TypeSatellite
OperatorESRO
Country / StateI-ESRO
ManufacturerLCT
BusESRO 1
Mass85 kg
ProgrammeESRO
CategorySCI
OrbitLEO (LLEO/P)
Altitude289 × 378 km
Inclination85.1°

Frequently asked questions

What happened to ESRO 1B?

ESRO 1B re-entered Earth's atmosphere on 23 Nov 1969, ending a mission that began with its launch in 1969. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did ESRO 1B re-enter the atmosphere?

ESRO 1B re-entered on 23 Nov 1969, according to Orbital Radar's historical catalogue records.

Who operated and built ESRO 1B?

ESRO 1B was operated by ESRO and built by LCT (I-ESRO).

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