DS-P1-Yu No. 31L

Re-entered 9 Aug 1970

DS-P1-Yu No. 31L (NORAD 4378, COSPAR 1970-033A) was a SU satellite that re-entered Earth's atmosphere on 9 Aug 1970, launched on 23 Apr 1970 on the DS-P1-Yu No. 31 mission. It was operated by PVO as part of the DS-P1-Yu A programme. The spacecraft was built by YUZH on the DS-P1 bus, with a mass of 200 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.

1970

launched

1970

re-entered

years on orbit

200

kg mass

Lifecycle

Launched23 Apr 1970 · on the DS-P1-Yu No. 31 mission

Operational9 Aug 1970 · entered service

Retired9 Aug 1970 · end of operational service

Re-entered9 Aug 1970 · atmospheric re-entry — object destroyed

Specifications

NORAD ID4378

COSPAR1970-033A

TypeSatellite

OperatorPVO

Country / StateSU

ManufacturerYUZH

BusDS-P1

Mass200 kg

ProgrammeDS-P1-Yu A

CategoryCAL

OrbitLEO (LLEO/I)

Altitude259 × 430 km

Inclination70.9°

Frequently asked questions

What happened to DS-P1-Yu No. 31L?

DS-P1-Yu No. 31L re-entered Earth's atmosphere on 9 Aug 1970, ending a mission that began with its launch in 1970. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did DS-P1-Yu No. 31L re-enter the atmosphere?

DS-P1-Yu No. 31L re-entered on 9 Aug 1970, according to Orbital Radar's historical catalogue records.

Who operated and built DS-P1-Yu No. 31L?

DS-P1-Yu No. 31L was operated by PVO and built by YUZH (SU).

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: DS-P1-Yu No. 31 → What is space debris? →