Messier object and New General Catalogue (NGC) 29 Disember 2009Posted by azmirul in Astronomy.
Tags: Messier object, NGC
selalu bila aku browse kat internet, utk astronomical object dia wakilkan guna nama code sama ada Messier object atau NGC (New General Catalogue)… elokgak guna nama code ni sebab kalo nak guna nama panjang sangat dan ader pelbagai nama utk object yg sama. kat bawah ni antara common Messier object bersama code NGC sebagai rujukan:
- M1 = Crab nebula (NGC 1952)
- M31 = Andromeda Galaxy (NGC 224)
- M42 = Orion nebula (NGC 1976)
- M45 = Pleiades / Seven Sisters star cluster
The Messier objects are a set of astronomical objects catalogued by the French astronomer Charles Messier in his “Catalogue des Nébuleuses et des Amas d’Étoiles” (“Catalogue of Nebulae and Star Clusters”), originally published in 1771, with the last addition (based on Messier’s observations) made in 1966.
Because Messier was interested in finding only comets, he created a list of non-comet objects that frustrated his hunt for them. The compilation of this list, in collaboration with his assistant Pierre Méchain, is known as the Messier catalogue. This catalogue of objects is one of the most famous lists of astronomical objects, and many Messier objects are still referenced by their Messier number.
The first edition included 45 objects, with Messier’s final list totaling 103 objects. Other astronomers, using side notes in Messier’s texts, eventually filled out the list to 110 objects.
The New General Catalogue (NGC) is a well-known catalogue of deep sky objects in astronomy. It contains 7,840 objects, known as the NGC objects. The NGC is one of the largest comprehensive catalogues, as it includes all types of deep space objects and is not confined to, for example, galaxies.