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Types of DSO's:
These are classified by the Messier Catalogue of 110 objects and the much more comprehensive New General Catalogue which contains nearly 8000 objects. Many sets of these and other objects from more specialised catalogues such as the UGC are used by amateurs as a test of their observing skills and their equipment. The so called Messier Marathon s occur only at a specific time of year when observers try to spot all 110 objects in one night. A much more demanding test known as Herschell's 400 is designed to tax larger Telescopes . |
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