Explorer 4
Re-entered 23 Oct 1959Explorer 4 (NORAD 9, COSPAR 1958 EPS) was a US satellite that re-entered Earth's atmosphere on 23 Oct 1959, launched on 26 Jul 1958. It was operated by ABMA / JPLA as part of the Explorer ABMA programme. The spacecraft was built by JPLA on the Explorer bus, with a mass of 12 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 Explorer 4?
Explorer 4 re-entered Earth's atmosphere on 23 Oct 1959, ending a mission that began with its launch in 1958. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.
When did Explorer 4 re-enter the atmosphere?
Explorer 4 re-entered on 23 Oct 1959, according to Orbital Radar's historical catalogue records.
Who operated and built Explorer 4?
Explorer 4 was operated by ABMA / JPLA and built by JPLA (US).