6h 23min, nov 5, 1964 y - Mariner 3
Failed Mars flyby attempt (NASA)
Mariner 3 was a 260 kg solar-cell and battery-powered spacecraft designed to make scientific measurements in the vicinity of Mars and to obtain photographs of the planet's surface and transmit these to Earth. It was intended that the spacecraft would encounter Mars after a 325-million mile journey in a little less than 8 months. A protective shield failed to eject after the spacecraft had passed through the atmosphere.
Added to timeline:
the videos are in the parts of Mars Exploration Rover Spirit...