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The joint European Space Agency (ESA) and National Aeronautics and Space Agency (NASA) mission called the Solar and Heliospheric Observatory (SOHO) is historically the second of five deep-space missions to be operated at one of the Sun-Earth collinear libration points by the NASA Goddard Space Flight Center (GSFC). Launched in December 1995 with a goal of revolutionizing solar science, SOHO has flown a halo-type libration point orbit (LPO) around the Sunward L1 point since March 1996. The billion-dollar SOHO mission was intended to have a two-year minimum lifetime, followed by an extended mission phase of at least four additional years. |
