Astronomy Astrophysics

Atlas of Great Comets by Ronald Stoyan

By Ronald Stoyan

Through the a while, comets, enigmatic and lovely wandering items that seem for weeks or months, have alternately involved and terrified humankind. the results of 5 years of cautious study, Atlas of serious Comets is a generously illustrated reference on thirty of the best comets which have been witnessed and documented because the heart a long time. targeted consciousness is given to the cultural and clinical impression of every visual appeal, supported by way of a wealth of pictures, from woodcuts, engravings, historic work and artifacts, to a exhibit of the easiest astronomical images and pictures. Following the advent, giving the vast old context and a latest medical interpretation, the nice Comets characteristic in chronological order. for every, there's a modern description of its visual appeal in addition to its medical, cultural and ancient value. no matter if you're an armchair astronomer or a professional comet-chaser, this mind-blowing reference merits a spot in your shelf.

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The goddess symbolized the mother of the Roman people, his bald head. Nevertheless, Vespasian died in June of that same year. and was the patroness of the Julian family. Caesar himself had intro­ Comet Halley’s return in AD 218 was seen by contemporaries as duced the games in 46 BC. Many contemporaries saw the comet as a a sign of the uprising against Emperor Opellius Macrinus. The co­ torch, marking the murder of Caesar, and thought that it represen­ met ‘caused great apprehension’ and was visible for 40 days during ted his soul, rising to heaven.

In 1607, Johannes Kepler succeeded in obtaining an or­ According to estimates, the comet has exhausted about half of its potential. This enormous reservoir has resulted bital calculation (albeit an erroneous one) •• In 1682, Edmond Halley observed the comet named after it in being the only periodic comet that is visible to the him, which later led to his famous prediction of its return naked eye at every return. Remnants of the comet’s tail •• In 1759, the first systematic search for a comet was un­ form the Eta Aquarid and Orionid meteor showers, which dertaken, and Johann Georg Palitzsch succeeded be­ occur when the Earth crosses the comet’s orbit, which is fore Charles Messier inclined at 162° to that of the Earth.

The reflectivity (albedo) of carry calculations backwards beyond 1404 BC. 9 and – the comet is almost completely black. Summary of cometary missions (after Leitner/Pilz) Name Target comet Country/Organisation Launch Date of encounter Distance of encounter ISEE-3/ICE 21P/Giacobini-Zinner 1P/Halley USA/NASA 12 Aug. 1978 11 Sep. 1985 28 Mar. 1986 7800 km 31 000 000 km Vega 1 Vega 2 1P/Halley USSR, Austria, German Federal Republic, France 15 Dec. 1984 21 Dec. 1984 6 Mar. 1986 9 Mar. 1986 8890 km 8030 km Sakigake 1P/Halley Japan 8 Jan.

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