Alternate ID's: 1956 PC, 1898 DQ
Size diameters (a,b,c): 34.4km × 11.2km × 11.2 km
Mass: (6.687±0.003)×1015 kg
Density: 2.67±0.03 g/cm3
Semi-major axis: 1.4579 AU
433 Eros is an S-type asteroid that was discovered on Aug. 13, 1898 by Gustav Witt, director of the Urania observatory in Berlin, and independently on the same day by Auguste H.P. Charlois at Nice, France. It is the largest of the near-Earth asteroids, with dimensions 34.4 × 11.2 × 11.2 km, and an orbit semi-major axis distance of 1.4576 AU (a member of the Amor group). The NEAR spacecraft moved into orbit around Eros on Valentine's Day, Feb. 14, 2000. After nearly a year in orbit, during which time the spacecraft was renamed "NEAR Shoemaker" in honor of astrogeology pioneer Eugene Shoemaker, the mission carried out humanity's first asteroid landing on Feb. 12, 2001.