P-11 No. 4420

Re-entered 11 Jan 1970

P-11 No. 4420 (NORAD 3297, COSPAR 1968-052B) was a US satellite that re-entered Earth's atmosphere on 11 Jan 1970, launched on 20 Jun 1968 on the CORONA J-47 mission. It was operated by NRO / SAFSP as part of the EHH B programme. The spacecraft was built by LMSC/CHAIL on the P-11 L bus, with a mass of 116 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.

1968

launched

1970

re-entered

years on orbit

116

kg mass

Lifecycle

Launched20 Jun 1968 · on the CORONA J-47 mission

Operational10 Jan 1970 · entered service

Retired10 Jan 1970 · end of operational service

Re-entered11 Jan 1970 · atmospheric re-entry — object destroyed

Specifications

NORAD ID3297

COSPAR1968-052B

TypeSatellite

OperatorNRO / SAFSP

Country / StateUS

ManufacturerLMSC/CHAIL

BusP-11 L

Mass116 kg

ProgrammeEHH B

CategorySIG

OrbitLEO (LLEO/P)

Altitude437 × 512 km

Inclination85.2°

Frequently asked questions

What happened to P-11 No. 4420?

P-11 No. 4420 re-entered Earth's atmosphere on 11 Jan 1970, ending a mission that began with its launch in 1968. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did P-11 No. 4420 re-enter the atmosphere?

P-11 No. 4420 re-entered on 11 Jan 1970, according to Orbital Radar's historical catalogue records.

Who operated and built P-11 No. 4420?

P-11 No. 4420 was operated by NRO / SAFSP and built by LMSC/CHAIL (US).

Launched together

CORONA J-47Re-entered 1968

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: CORONA J-47 → What is space debris? →