1) Impact crater on Mars 
Étienne Léopold Trouvelot was a French astronomer and entymologist. Craters named Trouvelot in his honor include: ...[lunar crater] Trouvelot is a lunar impact crater located to the south of the Mare Frigoris. It is a bowl-shaped formation with a higher albedo than its surroundings. The rim is roughly circular, but somewhat uneven. It has not been significantly eroded by subsequent impacts. The crater lies less than 10 kilometers to the south of the Valli...