The International Cometary Explorer (ICE) spacecraft, designed and launched as the International Sun-Earth Explorer-3 (ISEE-3) satellite, was launched on 12 August 1978 into a heliocentric orbit. It was one of three spacecraft, along with the mother ESA to study the interaction between the Earth's magnetic field and the solar wind.
ISEE-3 was the first spacecraft to be placed in a halo orbit at the L1 Earth-Sun Lagrange point.