1421 Esperanto in the outer asteroid belt at a distance of 2.8–3.4 AU once every 5 years and 5 months (1,983 days; semi-major axis of 3.09 AU). Its orbit has an eccentricity of 0.08 and an inclination of 10° with respect to the ecliptic. The body's observation arc begins with its first observation as at Heidelberg Observatory in October 1906, almost 30 years prior to its official discovery observation at Turku. This minor planet was named by the discoverer after the artificial language, Esperanto, which was created by inventor and writer, Ludwik Lejzer Zamenhof (1859–1917), who used the pseudonym "Doktoro Esperanto". The
The Ludwik Zamenhof Centre a permanent exhibition - Bialystok of Young Zamenhof – and various temporary exhibitions, concerts, film projections, and theatre performances. Moreover, the Centre regularly holds panel discussions, lectures, and literary promotions. The Zamenhof Centre organises also numerous educational workshops for children and teenagers and introduces modern social and educational projects, such as Living Library and „Discover Bialystok” – an outdoor game realised in the urban area of the city. The building where the Ludwik Zamenhof Centre is situated was included in the Jewish Heritage Trail, which was opened in June 2008 in Bialystok. The Trail was created by a group of