1307515
9781852334987
For variable stars up to magnitude 4 the naked eye can be used but from magnitudes 4 to 8 binoculars are needed. This guide for amateurs explains the type of equipment needed to go fainter than magnitude 9 and the charts needed to locate such objects.Good, Gerry A. is the author of 'Observing Variable Stars' with ISBN 9781852334987 and ISBN 1852334983.
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