NASA's Hubble Space Telescope has discovered a new moon orbiting the distant blue-green planet Neptune, the 14th known to be circling the giant planet. For now this moon is known as S/2004 N 1.
Estimated to be about 12 miles in diameter, the moon is located about 65,400 miles from Neptune, making it the smallest known moon in the Neptunian system. It is so small and dim that it is roughly 100 million times fainter than the faintest star that can be seen with the naked eye. It even escaped detection by NASA's Voyager 2 spacecraft, which flew past Neptune in 1989 and surveyed the planet's system of moons and rings. Showalter plotted a circular orbit for the moon, which completes one revolution around Neptune every 23 hours.
So officially Neptune has now got 14 moons.
