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TERRIERS

Re-entered 21 Oct 2023

TERRIERS (NORAD 25735, COSPAR 1999-026A) was a US satellite that re-entered Earth's atmosphere on 21 Oct 2023, launched on 18 May 1999 on the TERRIERS mission. It was operated by GSFC as part of the UNEX programme. The spacecraft was built by AEROA on the HETE bus, with a mass of 125 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.

1999
launched
2023
re-entered
24
years on orbit
125
kg mass

Lifecycle

Launched18 May 1999 · on the TERRIERS mission
Operational18 May 1999 · entered service
Retired18 May 1999 · end of operational service
Re-entered21 Oct 2023 · atmospheric re-entry — object destroyed

Specifications

NORAD ID25735
COSPAR1999-026A
TypeSatellite
OperatorGSFC
Country / StateUS
ManufacturerAEROA
BusHETE
Mass125 kg
ProgrammeUNEX
CategorySCI
OrbitLEO (LLEO/S)
Altitude540 × 554 km
Inclination97.7°

Frequently asked questions

What happened to TERRIERS?

TERRIERS re-entered Earth's atmosphere on 21 Oct 2023, ending a mission that began with its launch in 1999. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did TERRIERS re-enter the atmosphere?

TERRIERS re-entered on 21 Oct 2023, according to Orbital Radar's historical catalogue records.

Who operated and built TERRIERS?

TERRIERS was operated by GSFC and built by AEROA (US).

Launched together

MUBLCOMRe-entered 2005
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.
Browse the live satellite directory → Re-entered satellites archive → Launch record: TERRIERS → What is space debris? →