The moon of Jupiter – S/2003 J10 – was discovered in March 2003 by S.S. Sheppard. This discovery was achieved by 8.3-m Subaru telescope atop Mauna Kea (Hawaii). You can read additional details in The International Astronomical Union Circular (→IAU).
    S/2003 J10 is one of four new satellites Jupiter's new satellites discovered since the →Voyager-2 Jupiter system fly-by which occured 24 years ago (1979). With this moon, the astronomer discovered also: S/2003 J9, Kallichore and S/2003 J12. 
    The moon is in elliptical retrograde orbit (→eccentricity e = 0.4294) with a →semimajor axis a = 23,044,000 km. At pericenter (closest to the planet) S/2003 J10 is separated from the Jupiter a distance of q = 13,148,906 km. At apocenter (furthest from the planet) this moon is separated from the Jupiter a distance of Q = 32,939,094 km. In future these parameters may vary due to a large orbital distance from Jupiter and the orbital motion being disturbed by the Sun and other factors. Perhaps it is a captured asteroid (with a microscopic mass: ~1.4987×10¹³ kg – it equals 490 times less than a mountain like Giewont!), and in future will possibly return to heliocentric orbit.

    The orbital period is 2 earthly years, which means that the average speed of its celestial motion is only 0°30'09'' per day. When this motion was detected and compared to the changes in Jupiter's position, this body was classified as a true planetary satellite (and not a distant celestial body with its position projected near the planet).
    Other obstacle in detecting this moon earlier was its brightness of only 23.6^m (almost 11 million times fainter than the faintest stars visible to naked eye). For comparison: Jupiter's brightness is about –2.7^m, so S/2003 J10 is shining fainter by about 26.3^m. The corresponding difference in brightness is over 33 billion times!

I have given some crucial data of S/2003 J10 below. Table one contains the basic information. Whereas table two gives more detailed parametrs of its orbit (calculated using the following formulae).