|A Constellation is any one of the 88 areas into which the sky - or the celestial sphere - is divided. The term is also often used, incorrectly, to denote a group of stars visibly related to each other in a particular configuration or pattern. Examples of constellations are: Ursa Major (En: Great Bear), Orion and Leo.
|Charles Messier published a catalog of 45 deep sky objects (Nebulae and Clusters). In 1781 the catloque has grown to 110 objects.
|New General Cataloque
|The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. It contains nearly 8,000 objects, known as the NGC objects.
List of NGC Objects.
|Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination. RA can be used to determine a star's location and to determine how long it will take for a star to reach a certain point in the sky. That certain point is the Meridian.