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letra de mariner 10 - bongtower

november 3, 1973. the atlas / centaur launch vehicle launched mariner 10 to fly by mercury. this was the last sp-cecraft in the mariner program, since mariner 11 and mariner 12 were allocated to the voyager program and redesignated voyager 1 and voyager 2. passing venus “mariner-10” was the second sp-ce probe (after luna-3) to use gravity assist, lowering its perihelion with the help of venus to approach the orbit of mercury. the sp-cecraft flew past mercury three times. the first mercury encounter took place on 29 march 1974, at a range of 703 kilometers, on 21 september 1974, at a more distant range of 48,069 kilometers and on 16 march 1975, at a range of 327 kilometers. during the flight the sp-cecraft was only able to map 40–45% of mercury’s surface, taking over 2,800 photos. it revealed a more or less moon-like surface. mariner 10 also discovered mercury’s magnetic field. its radiometer readings suggested that mercury has a nighttime temperature of −183 °c and maximum daytime temperatures of 187 °c. it was discovered that mercury has a tenuous atmosphere consisting primarily of helium. this mission was the first and last visit to mercury in over 30 years

- bongtower

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