The Index Catalogue (IC) is a comprehensive collection of astronomical objects, primarily focusing on nebulae and star clusters. It was created by the American astronomer John Louis Emil Dreyer in the late 19th century as a supplement to the New General Catalogue (NGC). The IC provides detailed descriptions and positions of these celestial objects, making it a valuable resource for astronomers. The catalogue is divided into two parts: the first part includes objects numbered from IC 1 to IC 2099, while the second part contains objects numbered from IC 2100 to IC 2460. The IC is widely used in the field of astronomy for identifying and studying various deep-sky objects.