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
Orgelbrand's Universal Encyclopedia (1859) the first edition of the years (1872-1876, 1877-1879, 1883-1884, 1898-1904) had a volume-reduced form. In 1984-1985, a reprint of the original version was published in Poland. The creators of the publication's content were many representatives of the Polish nineteenth-century intelligentsia. In entry to the first volume published in 1859, a list of authors of the encyclopedia has been published. It contained the following names: Adam Adamowicz, Jerzy Alexandrowicz, Władysław Ludwik Anczyc, Michał Baliński, Jan Baranowski, Sadok Barącz, Adam Bartoszewicz, Julian Bartoszewicz, Władysław Bentkowski, Feliks Berdau, Leopold Berkiewicz, Cezary Biernacki, Julian Bleszyński, Kazimierz Bujnicki, Ignacy Chodźko, Teofil Cichocki, Wojciech Cybulski, Wincenty