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Messier 45 - the Pleiades in the constellation
Taurus |
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Object description: Messier 45 (Collinder 42) the Pleiades - also called the Atlantids, Atlantiades, Pleiades or the Seven Sisters - is an open star cluster which is already visible to the naked eye in the constellation Taurus. In the Messier catalog it has the designation M 45. The star cluster is named after figures of the Greek mythology. The Pleiades are one of the few objects in the sky that were known to mankind long before the invention of the telescope and therefore they are part of the folklore and myths of many cultures on our planet. Galileo Galilei was probably the first observer to look at the Pleiades through a telescope. He published his observation with a sketch of the cluster of 36 stars in March 1610 in his essay "Sidereus Nuncius". The 7 brightest stars are named after figures of Greek mythology, the Titan Atlas (therefore also Atlantides), his wife Pleione and their seven daughters Alkyone, Asterope, Celaeno, Elektra, Maia, Merope and Taygete. The Pleiades, who belong to the group of the nymphs, educated Dionysus and Zeus together. According to mythology, they were pursued by the celestial hunter Orion. Zeus moved the Pleiades to the sky as a constellation, but even there they are still pursued by Orion, whose constellation is located about 30° southeast of the Pleiades. The NGC catalog does not list the Pleiades separately as a single object, but there are some reflection nebulae in the area of the cluster with their own NGC numbers. These include the Maja Nebula (NGC 1432) and the Merope Nebula (NGC 1435). Only about half a minute of arc from Merope is a concentration of interstellar dust known as IC 349 or Barnard's Merope Nebula. The Pleiades, with an extent of about 2°, appear about four times the size of the Moon as seen with the naked eye. The star cluster lies nearly 445 light-years away from the solar system and contains at least 1200 stars which are on average about 125 million years old. Thus it is one of the youngest open star clusters in our Milky Way and due to its proximity to the solar system also one of the best explored. The true diameter is about 40 lightyears, the core of bright stars about 10 lightyears. |
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Note about the image: The image of the Pleiades was taken with our Pentax SDP 105. In this special case, a cross of 4 thin wires was mounted in front of the lens to create "spikes" and thus to reduce overexposure of the very bright Pleiades stars. | ||||||||||||||
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All Images and all Content are © by Franz Hofmann + Wolfgang Paech |