Explorer 59

A Delta 2914 launched ISEE-3, the first spacecraft to use a halo orbit around the Sun-Earth L1 Lagrange point. It was later renamed the International Cometary Explorer. In 2014 the ISEE-3 Reboot Project regained contact with it and fired its thrusters in July, but could not change its orbit, and contact was lost on 16 September 2014.