Asteroid
The dwarf planet Ceres is by far the largest asteroid, with a diameter of . The next largest are 4 Vesta and 2 Pallas, both with diameters of just over . Vesta is the only main-belt asteroid that can, on occasion, be visible to the naked eye. On some rare occasions, a near-Earth asteroid may briefly become visible without technical aid; see 99942 Apophis.
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.