Antonín Mrkos
3141 Buchar, provisional designation , is a dark Cybele asteroid from the outermost region of the asteroid belt, approximately in diameter. It was discovered on 2 September 1984, by Czech astronomer Antonín Mrkos at the Kleť Observatory. The D-type asteroid has a rotation period of 11.4 hours. It was named in memory of Czechoslovakian astronomer Emil Buchar.