P-11 No. 5104

Re-entered 13 Sep 1989

P-11 No. 5104 (NORAD 20220, COSPAR 1989-072A) was a US satellite that re-entered Earth's atmosphere on 13 Sep 1989, launched on 6 Sep 1989 on the P-11 No. 5104 mission. It was operated by NRO as part of the T2-SIG programme. The spacecraft was built by LMSC/MOTO on the NRO-T2 bus, with a mass of 1,450 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.

1989

launched

1989

re-entered

years on orbit

1,450

kg mass

Lifecycle

Launched6 Sep 1989 · on the P-11 No. 5104 mission

Operational13 Sep 1989 · entered service

Retired13 Sep 1989 · end of operational service

Re-entered13 Sep 1989 · atmospheric re-entry — object destroyed

Specifications

NORAD ID20220

COSPAR1989-072A

TypeSatellite

OperatorNRO

Country / StateUS

ManufacturerLMSC/MOTO

BusNRO-T2

Mass1,450 kg (1,200 kg dry)

ProgrammeT2-SIG

CategorySIG

OrbitLEO (LLEO/P)

Altitude185 × 300 km

Inclination85.0°

Frequently asked questions

What happened to P-11 No. 5104?

P-11 No. 5104 re-entered Earth's atmosphere on 13 Sep 1989, ending a mission that began with its launch in 1989. 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. 5104 re-enter the atmosphere?

P-11 No. 5104 re-entered on 13 Sep 1989, according to Orbital Radar's historical catalogue records.

Who operated and built P-11 No. 5104?

P-11 No. 5104 was operated by NRO and built by LMSC/MOTO (US).

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

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