Asteroid
Although their location in the asteroid belt excludes them from planet status, the three largest objects, Ceres, Vesta, and Pallas, are intact protoplanets that share many characteristics common to planets, and are atypical compared to the majority of "potato"-shaped asteroids. The fourth largest asteroid, Hygiea, has an undifferentiated interior, like the majority of asteroids. Between them, the four largest asteroids constitute half the mass of the asteroid belt.
13241 Biyo
The asteroid has not been surveyed by none of the space-based telescopes, such as the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer. The "Collaborative Asteroid Lightcurve Link" assumes an albedo for a stony asteroid of 0.24 – derived from 8 Flora, the largest member and namesake of this orbital family – and calculates a diameter of 3.92 kilometers with an absolute magnitude of 14.2.