🛰️ SATELLITE · HISTORICAL RECORD
IGS Optical-4
Retired 2023IGS Optical-4 (NORAD 37813, COSPAR 2011-050A) is a retired J satellite, withdrawn from service around 20 Apr 2023, launched on 23 Sep 2011 on the IGS Optical-4 mission. It was operated by CSICE as part of the IGS-O-G2 programme. The spacecraft was built by MELCO on the IGS-O bus, with a mass of 1,500 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
2011
launched
2023
retired
15
years on orbit
1,500
kg mass
Lifecycle
Launched23 Sep 2011 · on the IGS Optical-4 mission
Operational1 Apr 2019 · entered service
Retired20 Apr 2023 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID37813
COSPAR2011-050A
TypeSatellite
OperatorCSICE
Country / StateJ
ManufacturerMELCO
BusIGS-O
Mass1,500 kg (1,000 kg dry)
ProgrammeIGS-O-G2
CategoryIMG
OrbitLEO (LLEO/S)
Altitude588 × 591 km
Inclination97.7°
Frequently asked questions
What happened to IGS Optical-4?
IGS Optical-4 was retired from service around 20 Apr 2023 after launching in 2011. It is no longer operational but remains catalogued.
How long was IGS Optical-4 operational?
IGS Optical-4 was operational for roughly 4 years, from 1 Apr 2019 to 20 Apr 2023.
Who operated and built IGS Optical-4?
IGS Optical-4 was operated by CSICE and built by MELCO (J).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.