Stephen O'Meara's new and exciting observing guide spotlights an original selection of 109 deep-sky objects that will appeal to sky-watchers worldwide. His 'hidden treasures' include a wonderful assortment of galaxies, open clusters, planetary nebulae and more, all of which have been carefully chosen based on their popularity and ease of observing. None of these objects are included in either the Messier or the Caldwell catalogs, and all are visible in a 4-inch telescope under dark skies. Stunning photographs and beautiful drawings accompany detailed visual descriptions of the objects, which include their rich histories and astrophysical significance. The author's original finder charts are designed to help observers get to their targets fast and efficiently. This guide is fully consistent with O'Meara's previous books in this series, Deep-Sky Companions: The Messier Objects and Deep-Sky Companions: The Caldwell Objects. This allows observers to compare the physical properties and visual descriptions of objects covered by any of these books, with complete confidence. No other observing guides offer such consistency. Contains a biography of Caroline Herschel, written by the pre-eminent female astronomer Barbara Wilson of Houston, Texas Contains star charts designed by the author to help observers find their targets quickly and effectively