1857 Parchomenko, provisional designation 1971 QS1, is a stony asteroid from the inner regions of the asteroid belt. It was discovered by Russian astronomer Tamara Smirnova at Crimean Astrophysical Observatory in Nauchnyj on 30 August 1971. It was named in honor of female astronomer Praskoviya Georgievna Parchomenko (1886–1970), who observed and discovered several minor planets such as 1129 Neujmina and 1166 Sakuntala, at the Crimean Simeiz Observatory during the 1930s and 1940s.