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Contents · Categories · Featured content · A–Z index 243 Ida is an asteroid in the Koronis family of the main belt. It was discovered on 29 September 1884 by Johann Palisa and named after a nymph from Greek mythology. Later telescopic observations categorized Ida as an S-type asteroid, the most numerous type in the inner asteroid belt. On 28 August 1993, Ida was visited by the spacecraft Galileo, bound for Jupiter. It was the second asteroid to be visited by a spacecraft and the first found to possess a satellite. Like all main-belt asteroids, Ida's orbit lies between the planets Mars and Jupiter. Its orbital period is 4.84 years, and its rotation period is 4.63 hours. Ida has an average diameter of 31.4 km (19.5 mi). It is irregularly shaped and elongated, and apparently composed of two large objects connected together in a shape reminiscent of a croissant. Its surface is one of the most heavily cratered in the Solar System, featuring a wide variety of crater sizes and ages. Ida's moon, Dactyl, was discovered by mission member Ann Harch in images returned from Galileo. It was named after creatures which inhabited Mount Ida in Greek mythology. Data returned from the flyby pointed to S-type asteroids as the source for the ordinary chondrite meteorites, the most common type found on the Earth's surface. (more...) Recently featured: Hippocampus – Beth Hamedrash Hagadol – Battle of Ticonderoga From Wikipedia's newest articles: July 29: Ólavsøka in the Faroe Islands; National Anthem Day in Romania More anniversaries: July 28 – July 29 – July 30 Female flowers of a monoecious variety of black mulberry (Morus nigra), a species of mulberry native to southwestern Asia, where it has been cultivated for so long for its edible fruit that its precise natural range is unknown. Recently featured: Sea otter – New River Gorge Bridge – Monarch butterfly Wikipedia is hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other projects: This Wikipedia is written in English. Started in 2001, it currently contains 2,972,777 articles. Many other Wikipedias are available; some of the largest are listed below. daamn.net

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