Digital collage (2400x3200px) Iris is a large main-belt asteroid and perhaps remnant planetesimal orbiting the Sun between Mars and Jupiter. Iris was named after the rainbow goddess Iris in Greek mythology, who was a messenger to the gods, especially Hera. Her quality of attendant of Hera was particularly appropriate to the circumstances of discovery, as Iris was spotted following 3 Juno by less than an hour of right ascension