7 Iris

7 Iris is one of the brightest asteroids as seen from Earth with a maximum visual magnitude of 8.4, outshone only by Vesta, Ceres, and Pallas. An occupant of the main belt, it was discovered by John Hind in 1847.


diameter 208 km
spectral class S
semimajor axis 2.385 AU
perihelion 1.836 AU
aphelion 2.935 AU
eccentricity 0.231
inclination 5.52°
period 3.68 years