1858 Lobachevskij

Lobachevskij had already been photographed in precovery images dating back to the 1930s, providing it with a much larger observation arc. It orbits the Sun in the central main-belt at a distance of 2.5–2.9 AU once every 4 years and 5 months (1,620 days). Its orbit has an eccentricity of 0.08 and an inclination of 2° with respect to the ecliptic. First observed as at Heidelberg Observatory in 1928, the asteroid's first used observations was a precovery taken at Palomar Observatory in 1954, extending its observation arc by 18 years prior to its official discovery at Nauchnyj. == Naming ==

This minor planet was named in honor of mathematician Nikolai Lobachevsky (1792–1856), Russian mathematician and creator of the first comprehensive system of non-Euclidean geometry. The official was published by the Minor Planet Center on 1 June 1975 (). == Physical characteristics ==

Lobachevskij is a strongly reddish and relatively uncommon L-type asteroid in the SMASS classification. Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Lobachevskij measures between 10.769 and 10.919 kilometers in diameter, and its surface has an albedo between 0.3737 and 0.383, respectively, while the Collaborative Asteroid Lightcurve Link assumes a lower albedo of 0.18 and calculates a diameter of 12.47 kilometers with an absolute magnitude of 12.0. == References ==