A this moment how many moons are officially named on Jupiter?
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The total number of known moons of Jupiter now stands at 63, currently the most of any planet in the solar system. Many additional tiny moons may exist that have not yet been discovered.
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Jupiter as of now has 63 recognised moons.  Dr. Scott Shepard maintains a wonderfull webpage detailing all of them, their names, physical data and discovery.  Rather than just copying and pasting a large block of text I recomend that you check out his web page for all the info you request.
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It was 63 at the last census. Saturn has 56, Uranus 27, Neptune 13, Mars 2 and Earth 1 making 162 planetary moons in all,\n\nFirst to be discovered (in European culture)  were Io, Callisto, Europa and Ganymede in January 1610, by Galileo. But the Chinese astronomer Gan De is reported to have seen one of the moons of Jupiter (possibly Ganymede) with his naked eye in 364 BC,  Nearly 2,000 years earlier.\n\n15 of the moons still lack a name, and only have a designation. In order outwards from the planet, with their orbital periods, the 63 are as follows:\n\n1 Metis 7h 4m 29s\n2 Adrastea 7h 9m 30s\n3 Amalthea 11h 57m 22.67s\n4 Thebe 16h 11m 17s\n5 Io 1.77 days\n6 Europa 3.55 days\n7 Ganymede 7.15 days \n8 Callisto 16.69 days \n9 Themisto 129.87 days\n10 Leda 241.75 days \n11 Himalia 250.37 days \n12 Lysithea 259.89 days \n13 Elara 261.14 days \n14 S/2000 J 11 287.93 days \n15 Carpo 458.62 days \n16 S/2003 J 12 482.69 days \n17 Euporie 538.78 days \n18 S/2003 J 3  561.52 days \n19 S/2003 J 18  569.73 days \n20 Thelxinoe 597.61 days \n21 Euanthe 598.09 days \n22 Helike 601.40 days \n23 Orthosie 602.62 days\n24 Iocaste 609.43 days \n25 S/2003 J 16 610.36 days \n26 Praxidike 613.90 days \n27 Harpalyke 624.54 days \n28 Mneme 627.48 days \n29 Hermippe 629.81 days\n30 Thyone 639.80 days \n31 Ananke 642.02 days \n32 S/2003 J 17  672.75 days\n33 Aitne 679.64 days \n34 Kale 685.32 days \n35 Taygete 686.67 days \n36 S/2003 J 19  699.12 days \n37 Chaldene 699.33 days\n38 S/2003 J 15  699.68 days\n39 S/2003 J 10  700.13 days\n40 S/2003 J 23  700.54 days\n41 Erinome 711.96 days \n42 Aoede 714.66 days \n43 Kallichore 717.81 days \n44 Kalyke 721.02 days \n45 Carme 721.82 days \n46 Callirrhoe 722.62 days\n47 Eurydome 723.36 days\n48 Pasithee 726.93 days \n49 Cyllene 731.10 days \n50 Eukelade 735.20 days \n51 S/2003 J 4 739.29 days  \n52 Pasiphaë 741.09 days \n53 Hegemone 745.50 days \n54 Arche 746.19 days \n55 Isonoe 750.13 days \n56 S/2003 J 9  752.84 days\n57 S/2003 J 5  758.34 days \n58 Sinope 762.33 days \n59 Sponde 771.60 days\n60 Autonoe 772.17 days \n61 S/2003 J 14 776.02 days \n62 Megaclite 792.44 days \n63 S/2003 J 2  1077.02 days
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Jupiter has 63 moons or "natural satellites" ... http://www.answers.com/jupiter's%20moons\n\nThey have ALL been named ...\n\nThe Voyager 1 mission discovered three inner moons in 1979, bringing the total then known to 16 (17 if one counted Themisto, which had been found but then lost in 1975). The total rested there until 1999. Since then, researchers using sensitive ground-based detectors have recovered Themisto and found a further 46 tiny moons in long, eccentric, generally retrograde orbits. They average 3 kilometres in diameter, and the largest is barely 9 km across. All of these moons are thought to be captured asteroidal or perhaps cometary bodies, possibly fragmented into several pieces, but very little is actually known about them. The total number of known moons of Jupiter now stands at 63, currently the most of any planet in the solar system. Many additional tiny moons may exist that have not yet been discovered.
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There's really only one 'icy planet', and that's Pluto.  Mercury, Venus, Earth, and Mars are all terrestrial planets, while Jupiter, Saturn, Uranus, and Neptune are all jovian.  That leaves Pluto, and maybe that new one if they decide to call it a planet.
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With over sixty three moons to date and growing, Jupiter has more moons than any other planet in the Solar system*.  In fact, Jupiter and its moons are often referred to as the Jovian system (Jove being an alternate name for Jupiter), and are almost more complex as a planetary system than the Solar system itself is.\n\nThe planet with the second most numerous moons is the planet Saturn.  If you would like more information on either the moons of Jupiter or Saturn, I would highly recommend searching through either nasa.gov, nineplanets.org (which can be a little dry but still has a lot of useful information), or solarviews.com.\n\n\n*By the way, there's only one "Solar system" since the name refers to the star in the center of our star system, which is properly named "Sol", and not "the Sun"... all other systems containing a star and planets would be properly referred to as either a planetary system or a star system, as they do not orbit the star Sol.
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Tons!\n\nA moon is simply a large object that orbits a planet.\n\nThere are a total of 137 moons in our solar system. Here's the list of names and associated planets (see sources):
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Ganymede. It orbits Jupiter.
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Mercury, Venus, Mars, Jupiter, and Saturn.
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According to the authority of the IAU, there are nine planets in our solar system. In increasing distance from the Sun they are (with the astronomical symbol in brackets):\n\nMercury (☿) \nVenus (♀) \nEarth (♁) with one confirmed natural satellite, Luna (the Moon) \nMars (♂) with two confirmed natural satellites, Phobos and Deimos \nJupiter (♃) with sixty-three confirmed natural satellites \nSaturn (♄) with forty-six confirmed natural satellites \nUranus () with twenty-seven confirmed natural satellites \nNeptune (♆) with thirteen confirmed natural satellites \nPluto (♇) with three confirmed natural satellites, Charon, S/2005 P 1 and S/2005 P 2 \nHowever, there is some pressure for Pluto to be reclassified as a Kuiper Belt object, especially in light of the discovery of 2003 UB313. This object, however, has not yet received a definitive classification from the IAU.\n\nSedna was widely touted as a planet when it was discovered in 2003, as it was the largest object found since Pluto. However, mainly due to its size still being smaller than Pluto's, it did not achieve planetary status from the IAU. However, the discovery in 2005 of 2003 UB313 (nicknamed Xena), with a size and mass larger than Pluto seems to have forced the issue. As of January 2006 it has not yet been accepted as a planet, but the IAU is expected to announce a definition of a planet soon, which will likely either see 2003 UB313 become a planet, or have Pluto stripped of its status.
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Well, there's nine so far - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.  However, scientists have discovered other planets that orbit our Sun that are even further out than Pluto!  So there's a possibility that we may update our information involving the solar system sometime in the future....
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http://www.space.com/reference/pluto/moons.html
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The last time I checked there were still 9 planets and they were considering maybe adding a 10th. Pluto is a planet with a moon of it's own named Charon. Astronomers have also identified a couple of other large bodies orbiting beyond Pluto. It has been suggested that there could be two planetoids beyond Pluto that revolve around each other.
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Saturn has 31 known moons.
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Jupiter is the largest planet in our solar system. It is also one of the brighter objects in the night sky. No one knows for sure who discovered Jupiter, but we know the ancient Greeks named him after the god, Zeus. \n\nThe most prominent feature of Jupiter is the Great Red Spot. This violent storm has been observed from Earth since the 1600's. But it wasn't until the 1930's that we knew what Jupiter was made of. Astronomer Rupert Wildt researched the planet and found the atmosphere is mostly hydrogen and helium. \n\nBeginning in 1973, the United States sent four spacecraft to observe this massive planet. Pioneer 10 and 11, along with Voyager I and II, sailed past Jupiter. They gathered many images that we still see today. \n\nJupiter's moons are interesting too! Galileo discovered four of the larger moons: Io, Europa, Ganymede and Callisto in 1610. Most of the other moons were found by the Voyager spacecraft during its flyby. The Jupiter system is almost like a little solar system. Astronomers may continue to discover even more moons as more powerful telescopes become available.
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No, Jupiter can be seen without the aid of a telescope so there were millions of people before his time that would have seen Jupiter.  No one person can be credited with its discovery.\n\nHowever he is created with discovering Jupiter's four largest moons: Io, Europa, Callisto and Gandymede.  You do need a telescope to see those four and he was one of the first to use a telescope for astronomical purposes.  He made records of observing them.
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Here is a link that should be perfect! Scroll down a bit and there is a table with all the data you could possibly want!  http://en.wikipedia.org/wiki/2003J6%28moon%29--_statistics_of_Jupiter%27s_Moon