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Secor II S/N 3 (TR-27)

Re-entered 26 Feb 1968

Secor II S/N 3 (TR-27) (NORAD 1250, COSPAR 1965-017B) was a US satellite that re-entered Earth's atmosphere on 26 Feb 1968, launched on 11 Mar 1965 on the Secor Type II S/N 3 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. 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
1968
re-entered
3
years on orbit
18
kg mass

Lifecycle

Launched11 Mar 1965 · on the Secor Type II S/N 3 mission
Operational1 Mar 1965 · entered service
Retired1 Mar 1965 · end of operational service
Re-entered26 Feb 1968 · atmospheric re-entry — object destroyed

Specifications

NORAD ID1250
COSPAR1965-017B
TypeSatellite
OperatorACE / GIMR
Country / StateUS
ManufacturerITT
BusSecor
Mass18 kg
ProgrammeSecor II
CategoryGEOD
OrbitLEO (LEO/P)
Altitude282 × 967 km
Inclination90.0°

Frequently asked questions

What happened to Secor II S/N 3 (TR-27)?

Secor II S/N 3 (TR-27) re-entered Earth's atmosphere on 26 Feb 1968, 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 Secor II S/N 3 (TR-27) re-enter the atmosphere?

Secor II S/N 3 (TR-27) re-entered on 26 Feb 1968, according to Orbital Radar's historical catalogue records.

Who operated and built Secor II S/N 3 (TR-27)?

Secor II S/N 3 (TR-27) was operated by ACE / GIMR and built by ITT (US).

Launched together

NNS O-3Re-entered 1965
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.