Ctrl K

© Polaris Intelligence 2026

Privacy Terms Admin

Gravity Probe B

retired

Science ExplorationLEOCOSPAR 2004-014ALaunched 4/20/2004

Mission & Launch

Launch Mission: GP-B
Launch Vehicle: Delta 7920-10C
Launch Date: 4/20/2004
Last Contact: 5/22/2006

Orbit & Mass

Orbit Class: LEO
Altitude: 643 km
Inclination: 90.01 deg
Dry Mass: 2,805 kg
Total Mass: 3,145 kg

Payload Classification

Mission Type: Science Exploration
Payload Category: SCI/AST
Payload Class: C

Organizations

Operator: NASA Marshall Space Flight Center
Manufacturer: Lockheed Martin

Registry

COSPAR ID: 2004-014A
UN Registration: ST/SG/SER.E/451