🛰️ SATELLITE · HISTORICAL RECORD
Secor II S/N 2 (TR-27)
Retired 1965Secor II S/N 2 (TR-27) (NORAD 729, COSPAR 1964-001C) is a retired US satellite, withdrawn from service around 1 Sep 1965, launched on 11 Jan 1964 on the POPPY 3/HAYLOFT mission. It was operated by ACE / GIMR 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.
1964
launched
1965
retired
62
years on orbit
18
kg mass
Lifecycle
Launched11 Jan 1964 · on the POPPY 3/HAYLOFT mission
Operational1 Sep 1965 · entered service
Retired1 Sep 1965 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID729
COSPAR1964-001C
TypeSatellite
OperatorACE / GIMR
Country / StateUS
ManufacturerITT
BusSecor
Mass18 kg
ProgrammeSecor II
CategoryGEOD
OrbitLEO (LEO/I)
Altitude905 × 932 km
Inclination69.9°
Frequently asked questions
What happened to Secor II S/N 2 (TR-27)?
Secor II S/N 2 (TR-27) was retired from service around 1 Sep 1965 after launching in 1964. It is no longer operational but remains catalogued.
Who operated and built Secor II S/N 2 (TR-27)?
Secor II S/N 2 (TR-27) was operated by ACE / GIMR and built by ITT (US).
Launched together
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.