Sep 25 1992 - Mars Observer - Orbiter - Mission Failure - JPL / NASA

The Mars Observer spacecraft, also known as the Mars Geoscience/Climatology Orbiter, was a robotic space probe launched by NASA on September 25, 1992, to study the Martian surface, atmosphere, climate and magnetic field. On August 21, 1993, during the interplanetary cruise phase, communication with the spacecraft was lost, three days prior to the probe's orbital insertion. Attempts to re-establish communications with the spacecraft were unsuccessful. 

 

Mars Observer: Wikipedia. 

 

Mars Observer: Orbiter Addon.