 Ceres was the first asteroid discovered , by Giuseppe Piazzi at Palermo on 1 January 1801 . It was originally considered a planet , but was reclassified as an asteroid in the 1850s when many other objects in similar orbits were discovered . 
 Ceres was the first asteroid discovered , by Giuseppe Piazzi at Palermo on 1 January 1801 . It was originally considered a planet , but was reclassified as an asteroid in the 1850s when many other objects in similar orbits <a href='uninflect' title='1'><mark>were</mark></a> discovered . 
Ceres was the first asteroid discovered , by Giuseppe Piazzi at Palermo on 1 January 1801 . It was originally considered a planet , but was reclassified as an asteroid in da 1850s when many other objects in similar orbits was discovered .