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Explorer 2
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== Thermal control == The exterior [[temperature control]] was achieved by coating a fraction of the stainless steel satellite casing with an aluminum oxide ceramic (Rokide A). Approximately 30% of the nose cone (upper 30 cm of the satellite) and 25% of the upper {{cvt|51.4|cm}} of the cylindrical body were coated in longitudinal stripes. There was insulation between the nose cone and instrument compartment, and between the instrument compartment and rocket motor section.<ref name="Instrument4"/> An internal temperature range of -5 °C to +45 °C was required for proper operation of the equipment in the satellite. The batteries would not operate below -5 °C, but low temperatures would not damage the batteries or equipment. Permanent damage to the equipment would not occur unless the temperature rose above +80 °C.<ref name="Instrument4"/>
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