Deep space object (or deep sky) is a term often used in amateur astronomy to refer to celestial objects that are not from the Solar System (such as planets, comets, and asteroids), or individual stars or systems of astronomy. multiple stars. Normally, these objects are not visible to the naked eye, but the brightest can be seen with a small telescope or even with powerful binoculars. An object of deep space: Galaxy NGC 4526 and supernova SN1994D (constellation of Virgo).
Types of deep space objects: Dark nebulae Planetary nebulae Galaxies Quasars
They are classified according to the Messier Catalog of 110 objects and the New General Catalog (NGC), much more complete, which contains about 8,000 objects. Many of these objects and others included in more specialized catalogs such as the Uppsala General Catalog (UGC) allow amateur astronomers to demonstrate their observation skills and test their equipment. The so-called Messier marathons are held during certain days of the year and the observers try to sight the 110 objects in a single night. A much more demanding test based on the Herschel 400 list is designed to test older telescopes.
wiki
