Nemrut (volcano) inside the caldera, becoming the world's second largest caldera lake. Subsequent eruptions separated a small lake Ilı from Lake Nemrut. Nemrut volcano has an elliptical shape, its size at the base is 27×18 km, and its center contains 377.5 km of volcanic materials. The caldera of Nemrut is the largest in Turkey, the fourth largest in Europe and sixteenth largest in the world. Locals link the name of the volcano with the legendary ruler Nimrod, who is credited with the construction of the Tower of Babel. Turkish chronicles of the 16th century reproduce a local legend as follows: Eruptions of
20936 Nemrut Dagi and 6 months (922 days). Its orbit has an eccentricity of 0.10 and an inclination of 19° with respect to the ecliptic. Due to its perihelion of less than 1.668 AU, "Nemrut Dagi" is classified as a Mars-crosser by the Lightcurve Data Base, while in JPL's data base, which requires a perihelion of less than 1.666 AU, the asteroid is simply an inner main-belt asteroid. The asteroid's observation arc begins 18 years prior to its official discovery observation, with its identification at Palomar Observatory in February 1953. The survey designation "T-1" stands for the first Palomar–Leiden Trojan survey, named after