🛰️ SATELLITE · HISTORICAL RECORD
Secor II S/N 18 (ITT MAT)
Retired 1975Secor II S/N 18 (ITT MAT) (NORAD 4363, COSPAR 1970-025B) is a retired US satellite, withdrawn from service around 1 Jan 1975, launched on 8 Apr 1970 on the Nimbus D mission. It was operated by ARTOPL as part of the Secor II programme. The spacecraft was built by ITT on the Secor bus, with a mass of 18 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1970
launched
1975
retired
56
years on orbit
18
kg mass
Lifecycle
Launched8 Apr 1970 · on the Nimbus D mission
Operational1 Jan 1975 · entered service
Retired1 Jan 1975 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID4363
COSPAR1970-025B
TypeSatellite
OperatorARTOPL
Country / StateUS
ManufacturerITT
BusSecor
Mass18 kg
ProgrammeSecor II
CategoryGEOD
OrbitLEO (LEO/S)
Altitude1,085 × 1,090 km
Inclination99.9°
Frequently asked questions
What happened to Secor II S/N 18 (ITT MAT)?
Secor II S/N 18 (ITT MAT) was retired from service around 1 Jan 1975 after launching in 1970. It is no longer operational but remains catalogued.
Who operated and built Secor II S/N 18 (ITT MAT)?
Secor II S/N 18 (ITT MAT) was operated by ARTOPL and built by ITT (US).
Launched together
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.