DS-U2-IK No. 4 (Ion)

Re-entered 11 Jul 1975

DS-U2-IK No. 4 (Ion) (NORAD 7500, COSPAR 1974-086A) was a SU satellite that re-entered Earth's atmosphere on 11 Jul 1975, launched on 31 Oct 1974 on the DS-U2-IK No. 4 mission. It was operated by IK as part of the DS-U2-IK programme. The spacecraft was built by YUZH on the DS-U2 bus, with a mass of 317 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.

1974

launched

1975

re-entered

year on orbit

317

kg mass

Lifecycle

Launched31 Oct 1974 · on the DS-U2-IK No. 4 mission

Operational20 Feb 1975 · entered service

Retired20 Feb 1975 · end of operational service

Re-entered11 Jul 1975 · atmospheric re-entry — object destroyed

Specifications

NORAD ID7500

COSPAR1974-086A

TypeSatellite

OperatorIK

Country / StateSU

ManufacturerYUZH

BusDS-U2

Mass317 kg

ProgrammeDS-U2-IK

CategorySCI

OrbitLEO (LLEO/I)

Altitude240 × 662 km

Inclination74.0°

Frequently asked questions

What happened to DS-U2-IK No. 4 (Ion)?

DS-U2-IK No. 4 (Ion) re-entered Earth's atmosphere on 11 Jul 1975, 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 DS-U2-IK No. 4 (Ion) re-enter the atmosphere?

DS-U2-IK No. 4 (Ion) re-entered on 11 Jul 1975, according to Orbital Radar's historical catalogue records.

Who operated and built DS-U2-IK No. 4 (Ion)?

DS-U2-IK No. 4 (Ion) was operated by IK and built by YUZH (SU).

Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.

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