Voyager 2 at Neptune, Jet Propulsion Laboratory, Pasadena, California, August 25, 1989, the 'Last Supper' of the Voyager Program. NASA's Voyager 2 became the first spacecraft to observe the planet Neptune, its final planetary target. Passing about 4,950 kilometers (3,000 miles) above Neptune's north pole, Voyager 2 made its closest approach to any planet since leaving Earth 12 years before. Five hours later, the spacecraft passed about 40,000 kilometers (25,000 miles) from Neptune's largest moon