Ctrl K

© Polaris Intelligence 2026

Privacy Terms Admin

Discovery (STS-39)

retired

Human SpaceflightLEOCOSPAR 1991-031ALaunched 4/28/1991

Mission & Launch

Launch Mission: SDIO/SPAS
Launch Vehicle: Space Shuttle
Launch Date: 4/28/1991
Last Contact: 5/6/1991

Orbit & Mass

Orbit Class: LEO
Altitude: 253.5 km
Inclination: 57 deg
Dry Mass: 85,723 kg
Total Mass: 107,330 kg

Payload Classification

Mission Type: Human Spaceflight
Payload Category: SS
Payload Class: C

Organizations

Operator: NASA Johnson Space Center
Manufacturer: Boeing

Registry

COSPAR ID: 1991-031A
UN Registration: ST/SG/SER.E/258