By Stephen James O'Meara
The Herschel four hundred is an inventory of four hundred galaxies, nebulae, and superstar clusters, picked from over 2,500 deep-sky gadgets came across and catalogued by means of the nice eighteenth-century astronomer Sir William Herschel and his sister Caroline. It contains 231 galaxies, 107 open clusters, 33 globular clusters, 20 planetary nebulae, 2 halves of a unmarried planetary nebula, and seven vibrant nebulae. during this advisor Steve O'Meara takes the observer throughout the record, season via season, month by means of month, evening by means of evening, item by means of item. He works throughout the items in a delicately deliberate and methodical approach, taking in essentially the most dramatic non-Messier galaxies, nebulae, and celebrity clusters within the evening sky. perfect for astronomers who've tackled the Messier items, this richly illustrated advisor may also help the novice astronomer hone their staring at talents.
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