Artistic representation of the triple asteroid system showing the large asteroid Sylvia surrounded by its two satellites, Romulus and Remus. The differentiated interior of the asteroid is shown through a cutaway diagram. The primary asteroid of the system may have a dense, regularly-shaped core, surrounding by a fluffy or fractured material. The two moons are shown to be strongly elongated, and composed of two lobes, as suggested by the recently observed occultation data by the satellite Romulus.
Danielle Futselaar/SETI Institute