\<COLOUR 1> ORBIT: \<COLOUR 0> Highly elliptical, 192/197,616 km
\<COLOUR 1> SIZE: \<COLOUR 0> Octagonal, 34 cm long, 74 cm diameter
\<COLOUR 1> WEIGHT: \<COLOUR 0> 62 kg
\<COLOUR 1> COUNTRY: \<COLOUR 0> USA
\<COLOUR 1> COMMENTS: \<COLOUR 0> First of the IMP (interplanetary monitoring platform) Explorer series of geophysical satellites; confirms the teardrop shape of the Earth's magnetic field in space, and discovers the 'bow shock wave' ahead of the Earth's field.