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
Ludwik Marteau Czaplic, Michał Jerzy Mniszech, Ignacy Potocki, Andrzej Mokronowski, Stanisław Poniatowski, Stanisław Trembecki, Andrzej Hieronim Zamoyski, Grzegorz Piramowicz, Franciszek Bohomolec and (one of his best-known) Hugo Kołłątaj. In 1831, following the November Uprising, most of his portraits were transported to Saint Petersburg by order of Tsar Nicholas I. Three years later, they were burned in an effort to destroy significant records of Polish culture. Ludwik Marteau Ludwik Marteau, originally Louis-François Marteau (c.1715, Paris - 2 November 1804, Warsaw) was a French-born Polish court painter who served under kings Augustus III and Stanisław August Poniatowski. All of his known works are portraits;