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Mariner 8
Mariner-H (Mariner Mars '71), also commonly known as Mariner 8, was (along with Mariner 9) part of the Mariner Mars '71 project. It was intended to go into Mars orbit and return images and data, but a launch vehicle failure prevented Mariner 8 from even achieving an Earth orbit and the spacecraft reentered into the Atlantic Ocean shortly after launch.〔
==Mission==
Mariner 8 was launched on an Atlas-Centaur SLV-3C booster (AC-24). The main Centaur engine was ignited 265 seconds after launch, but the upper stage began to oscillate in pitch and tumbled out of control. The Centaur stage shut down 365 seconds after launch due to starvation caused by the tumbling. The Centaur and spacecraft payload separated and re-entered the Earth's atmosphere approximately 1500 km downrange and fell into the Atlantic Ocean about 560 km north of Puerto Rico.
A guidance system failure was quickly suspected as the culprit, but JPL navigation chief Bill O'Neil dismissed the idea that the entire guidance system had failed. He argued that an autopilot malfunction had occurred since the event had occurred at the exact moment when the system was supposed to activate. Investigation proceeded quickly and the problem was soon discovered to be the result of a malfunction in the pitch rate gyro amplifier. A diode intended to protect the system from transient voltages was thought to have been damaged during repairs/installation of the pitch amplifier's printed circuit board, something that would not have been detected through bench tests.
As of 2015, Mariner 8 is the most recent US planetary probe to be lost in a launch vehicle malfunction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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