Research satellite
artificial satellite designed for scientific research
Geophysical Research Satellite
Luna 2
Explorer 13
LES 2
Explorer 50
Injun
Injun 5
Energetic Particles Explorer
Long Duration Exposure Facility
MICROSCOPE
weather satellite
Ion Release Module
Polar BEAR
Akebono
DODGE
Explorer 4
Sputnik 3
European Retrievable Carrier
Explorer 24
Interstellar Mapping and Acceleration Probe
Explorer 3
Vanguard
X-ray astronomy satellite
SMOG-P
Interstellar Boundary Explorer
Solar Cruiser
Space Weather Follow On-Lagrange 1
Injun 4
geodetic satellite