SO-M No. 505

Re-entered 25 Nov 1976

SO-M No. 505 (NORAD 9557, COSPAR 1976-112A) was a SU satellite that re-entered Earth's atmosphere on 25 Nov 1976, launched on 25 Nov 1976 on the SO-M No. 505 mission. It was operated by IKI / BABTS as part of the SO-M programme. The spacecraft was built by NPOL on the SO-M bus, with a mass of 930 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.

1976

launched

1976

re-entered

years on orbit

930

kg mass

Lifecycle

Launched25 Nov 1976 · on the SO-M No. 505 mission

Operational20 Jul 1977 · entered service

Retired20 Jul 1977 · end of operational service

Re-entered25 Nov 1976 · atmospheric re-entry — object destroyed

Specifications

NORAD ID9557

COSPAR1976-112A

TypeSatellite

OperatorIKI / BABTS

Country / StateSU

ManufacturerNPOL

BusSO-M

Mass930 kg

ProgrammeSO-M

CategoryAST

OrbitLEO (DSO)

Altitude3,869 × 195,485 km

Inclination66.6°

Frequently asked questions

What happened to SO-M No. 505?

SO-M No. 505 re-entered Earth's atmosphere on 25 Nov 1976, ending a mission that began with its launch in 1976. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did SO-M No. 505 re-enter the atmosphere?

SO-M No. 505 re-entered on 25 Nov 1976, according to Orbital Radar's historical catalogue records.

Who operated and built SO-M No. 505?

SO-M No. 505 was operated by IKI / BABTS and built by NPOL (SU).

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

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