Asterism (astronomy) | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Asterism_(astronomy)


00:01:39 1 Background of asterisms and constellations
00:04:35 2 Large or bright asterisms
00:07:02 2.1 Constellation based asterisms
00:09:45 2.2 Commonly recognised asterisms
00:12:14 2.3 Cross-border asterisms
00:14:45 2.4 Telescopic asterisms
00:15:26 3 See also



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SUMMARY
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In observational astronomy, an asterism is a popularly-known stationary pattern or group of stars that are recognised in the night sky as viewed from Earth. This colloquial definition makes it appear quite similar to a constellation, but they differ mostly in that a constellation is an officially recognized area of the sky, while an asterism is a visually obvious collection of stars and the lines used to mentally connect them; as such, asterisms do not have officially determined boundaries and are therefore a more general concept which may refer to any identified pattern of stars. This distinction between terms remains somewhat inconsistent, varying among published sources. An asterism may be understood as an informal group of stars within the area of an official or defunct former constellation. Some include stars from more than one constellation.
Asterisms are frequently simple shapes containing a few or many bright stars, making them easy to identify. This can be particularly useful for people who are familiarizing themselves with the night sky. For example, the asterisms known as The Plough (Charles' Wain, the Big Dipper, etc.) comprises the seven brightest stars in the International Astronomical Union (IAU) recognised constellation Ursa Major. Another is the asterism of the Southern Cross, whose recognised constellation is Crux (crux is an area of the night sky in which the Southern Cross is located).