American Scientists have discovered a new moon of Neptune through NASA's Hubble space telescope, the American space agency said in a press release.

The new moon called S/2004 N 1 is the 14th moon to be discovered that are circling the giant planet in our solar system. The new celestial body is the smallest moon in the Neptunian system and just 20 km measures and it completes completing one revolution around Neptune every 23 hours. US astronomer Mark Showalter discovered the tiny dot through the advanced telescope while analysing segments of rings around Neptune.

The space agency said that the moon is 100 million times dimmer than the starts visible to the naked eye. The moon is so small that it was not spotted by the Voyager spacecraft in 1989 when it passed near the planet and studied planet's system of moons and rings. This time, the method of discovery included tracking the movement of a white fleck that appeared repeatedly in more than 150 photographs taken of Neptune by Hubble between 2004 and
2009.

"The moons and arcs orbit very quickly, so we had to devise a way to follow their motion in order to bring out the details of the system. It's the same reason a sports photographer tracks a running athlete - the athlete stays in focus, but the background blurs," Mr Showalter explained.