8h 51min, jul 12, 1988 y - Phobos 2
Mostly failed Mars orbiter & 2 Phobos landers
Phobos 2 was designed to orbit Mars and land a "hopper" and a lander on the surface of Phobos. The spacecraft successfully went into orbit and began sending back preliminary data. Then, on March 27, 1989, just before the spacecraft was to move within 50 meters of Phobos and deploy the two landers, the spacecraft's onboard computer malfunctioned and the mission was lost.
Added to timeline:
the videos are in the parts of Mars Exploration Rover Spirit...