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🛰️ SATELLITE · HISTORICAL RECORD

Transit 3B

Re-entered 30 Mar 1961

Transit 3B (NORAD 87, COSPAR 1961 ETA) was a US satellite that re-entered Earth's atmosphere on 30 Mar 1961, launched on 22 Feb 1961. It was operated by BUWEPS as part of the Transit programme. The spacecraft was built by APL on the Transit 1 bus, with a mass of 170 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.

1961
launched
1961
re-entered
0
years on orbit
170
kg mass

Lifecycle

Launched22 Feb 1961
Operational30 Mar 1961 · entered service
Retired30 Mar 1961 · end of operational service
Re-entered30 Mar 1961 · atmospheric re-entry — object destroyed

Specifications

NORAD ID87
COSPAR1961 ETA
TypeSatellite
OperatorBUWEPS
Country / StateUS
ManufacturerAPL
BusTransit 1
Mass170 kg
ProgrammeTransit
CategoryNAV
OrbitLEO (LLEO/I)
Altitude167 × 1,002 km
Inclination28.4°

Frequently asked questions

What happened to Transit 3B?

Transit 3B re-entered Earth's atmosphere on 30 Mar 1961, ending a mission that began with its launch in 1961. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did Transit 3B re-enter the atmosphere?

Transit 3B re-entered on 30 Mar 1961, according to Orbital Radar's historical catalogue records.

Who operated and built Transit 3B?

Transit 3B was operated by BUWEPS and built by APL (US).

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