Asterisms are star-shapes which aren't constellations in their own right, but are instantly recognisable to amateur astronomers who invariably find their way around the night sky by referencing them.
An asterism is a familiar (to night-sky watchers) group of stars which forms a pattern and the stars aren't part of a related cluster but just a chance alignment.
See full article at http://www.bbc.co.uk/dna/h2g2/A63021359
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