IC 559 refers to an astronomical catalog entry from the Index Catalogue (IC) of astronomical objects. In this context:
C. Galaxy
Nebulae, star clusters, and galaxies are among the celestial objects listed in the Index Catalogue (IC). Specifically, IC 559 designates a galaxy-class celestial object.
Huge systems of stars, interstellar gas, dust, dark matter, and stellar remnants bound together by gravity are known as galaxies. They are the basic building pieces of the universe, appearing in a variety of sizes and forms and frequently numbering in the billions or trillions.