S/2003 J 3 is a small moon that orbits the planet Jupiter. It was discovered in 2003 and is part of a group of moons known as the Carme group, which are irregularly shaped and have similar orbits. This moon is relatively tiny, with a diameter of about 2 kilometers. The moon's surface is likely composed of ice and rock, similar to other moons in its group. S/2003 J 3 is one of the many natural satellites of Jupiter, which is the largest planet in our solar system and has a total of 79 known moons.