HomeLibraryRe-entered SatellitesSolar Explorer C
🛰️ SATELLITE · HISTORICAL RECORD

Solar Explorer C

Re-entered 15 Dec 1979

Solar Explorer C (NORAD 5317, COSPAR 1971-058A) was a US satellite that re-entered Earth's atmosphere on 15 Dec 1979, launched on 8 Jul 1971 on the Solar Explorer C mission. It was operated by NRL as part of the Solrad programme. The spacecraft was built by NRL on the SR 10 bus, with a mass of 119 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.

1971
launched
1979
re-entered
8
years on orbit
119
kg mass

Lifecycle

Launched8 Jul 1971 · on the Solar Explorer C mission
Operational1 Jul 1978 · entered service
Retired1 Jul 1978 · end of operational service
Re-entered15 Dec 1979 · atmospheric re-entry — object destroyed

Specifications

NORAD ID5317
COSPAR1971-058A
TypeSatellite
OperatorNRL
Country / StateUS
ManufacturerNRL
BusSR 10
Mass119 kg
ProgrammeSolrad
CategoryAST
OrbitLEO (LLEO/I)
Altitude435 × 631 km
Inclination51.0°

Frequently asked questions

What happened to Solar Explorer C?

Solar Explorer C re-entered Earth's atmosphere on 15 Dec 1979, ending a mission that began with its launch in 1971. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did Solar Explorer C re-enter the atmosphere?

Solar Explorer C re-entered on 15 Dec 1979, according to Orbital Radar's historical catalogue records.

Who operated and built Solar Explorer C?

Solar Explorer C was operated by NRL and built by NRL (US).

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