After Orion was killed by Artemis, Menippe and Metioche were brought up by their mother, and Athena taught them the art of weaving, and Aphrodite gave them beauty. A daughter of Orion and sister of Metioche. THE KORONOI x2 (Ovid Metamorphoses 13.685) MENIPPE, METIOKHE (Antoninus Liberalis 25) OFFSPRING ORION (Antoninus Liberalis 25, Ovid Metamorphoses 13.685) NAMES The name Koronides was associated with the Greek words korônis, "curving one" or "comet" and also korônê "the shuttle" and "crow." Persephone in pity then turned them into a pair of comets. When the land of Boiotia (Boeotia) was struck by drought they voluntarily offered themselves up as a sacrifice to the gods, bashing out their own brains with shuttles. Comets for which there are insufficient observations to calculate an orbit are given the prefix X/.THE KORONIDES (Coronides) were two nymph daughters of the giant Orion. Comets that are defunct-either observed to have disintegrated or simply disappeared-are given the prefix D/ (e.g. The names of periodic comets are preceded by P/ and a number indicating the order in which their periodicity was established (e.g. C/1999 D3 would be the third comet discovered during the second half of 1999 February). Comet names plus#According to a convention introduced in 1995, comets are identified by the year and a letter indicating the half-month in which they were discovered, plus the order of discovery in that half-month (e.g. Comets are named after their discoverers (now usually restricted to two names), or the spacecraft or survey which found them, and are also assigned a designation based on when they were discovered. Comet names professional#Some comets are discovered by amateur astronomers conducting deliberate searches, but most are found on images taken by professional astronomers recently, over a hundred comets a year passing close to the Sun have been found on images taken by the Solar and Heliospheric Observatory (SOHO) ( see Kreutz Sungrazer Sunskirter). One spectacular example was Comet Shoemaker–Levy 9, which hit Jupiter in 1994. During their passage through the inner Solar System comets can have their orbits altered by the gravitational influence of the planets, notably Jupiter. At the end of 2010 over 3000 comets were known, of which over 90% are long-period comets. The most famous of these, and the brightest, is Halley's Comet. The remainder are periodic comets, either new discoveries or known objects following predicted orbits. Most are new long-period comets appearing for the first time, with orbital periods of over 200 years. The mass of a typical comet is perhaps 10 14 kg.Įach year over 200 comets are seen with telescopes and space satellites only a few ever become bright enough to be visible with the naked eye. Despite their size, a comet's coma and tail are of such low density that background stars can be seen through them. Around the visible coma is an even larger cloud of hydrogen, detectable at ultraviolet wavelengths. Whereas the nucleus may be only 1 km or so across, the coma can extend for 10 5 km or more from the nucleus and the tail for 10 8 km}. As the nucleus nears the Sun it heats up and releases gas and dust, forming first a coma and, in some cases, a tail ( see coma, cometary nucleus, cometary tail, cometary). When a comet is far from the Sun its nucleus is frozen solid and shines only by reflecting sunlight. From there they can be perturbed by the gravitational influence of passing stars into new orbits that bring them into the inner Solar System, where they become visible from Earth. Comets are thought to exist in vast numbers in the Oort Cloud and Kuiper Belt, beyond the planets. The name derives from the Greek kometes, meaning ‘long-haired’. A small body, composed of ice and dust, in orbit around the Sun.
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