DOS-4
Re-entered 2 Feb 1977DOS-4 (NORAD 7591, COSPAR 1974-104A) was a SU satellite that re-entered Earth's atmosphere on 2 Feb 1977, launched on 26 Dec 1974 on the DOS 4 (17K No. 124) mission. It was operated by NPOE as part of the DOS programme. The spacecraft was built by ZIKH on the Almaz bus, with a mass of 18,500 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 DOS-4?
DOS-4 re-entered Earth's atmosphere on 2 Feb 1977, ending a mission that began with its launch in 1974. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.
When did DOS-4 re-enter the atmosphere?
DOS-4 re-entered on 2 Feb 1977, according to Orbital Radar's historical catalogue records.
Who operated and built DOS-4?
DOS-4 was operated by NPOE and built by ZIKH (SU).