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P-11 No. 4401

Re-entered 31 Oct 1969

P-11 No. 4401 (NORAD 1329, COSPAR 1965-031B) was a US satellite that re-entered Earth's atmosphere on 31 Oct 1969, launched on 28 Apr 1965 on the GAMBIT SV 967 mission. It was operated by NRO / SAFSP as part of the EHH B programme. The spacecraft was built by LMSC/EDLS on the P-11 L bus, with a mass of 89 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.

1965
launched
1969
re-entered
4
years on orbit
89
kg mass

Lifecycle

Launched28 Apr 1965 · on the GAMBIT SV 967 mission
Operational1 Jan 1966 · entered service
Retired1 Jan 1966 · end of operational service
Re-entered31 Oct 1969 · atmospheric re-entry — object destroyed

Specifications

NORAD ID1329
COSPAR1965-031B
TypeSatellite
OperatorNRO / SAFSP
Country / StateUS
ManufacturerLMSC/EDLS
BusP-11 L
Mass89 kg
ProgrammeEHH B
CategorySIG
OrbitLEO (LLEO/S)
Altitude500 × 548 km
Inclination95.2°

Frequently asked questions

What happened to P-11 No. 4401?

P-11 No. 4401 re-entered Earth's atmosphere on 31 Oct 1969, ending a mission that began with its launch in 1965. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did P-11 No. 4401 re-enter the atmosphere?

P-11 No. 4401 re-entered on 31 Oct 1969, according to Orbital Radar's historical catalogue records.

Who operated and built P-11 No. 4401?

P-11 No. 4401 was operated by NRO / SAFSP and built by LMSC/EDLS (US).

Launched together

GAMBIT SV 967Re-entered 1965
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.