Sentry
Re-entered 25 Mar 2026Sentry (NORAD 59140, COSPAR 2024-043AU) was a US satellite that re-entered Earth's atmosphere on 25 Mar 2026, launched on 4 Mar 2024 on the Transporter-10 mission. It is catalogued as Scout-1. It was operated by Quantum Space as part of the Quantum Space programme. The spacecraft was built by QUSP on the Cubesat 6U bus, with a mass of 10 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.
Lifecycle
Specifications
Frequently asked questions
What happened to Sentry?
Sentry re-entered Earth's atmosphere on 25 Mar 2026, ending a mission that began with its launch in 2024. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.
When did Sentry re-enter the atmosphere?
Sentry re-entered on 25 Mar 2026, according to Orbital Radar's historical catalogue records.
Who operated and built Sentry?
Sentry was operated by Quantum Space and built by QUSP (US).