1862 – Alvan Graham Clark discovers the white dwarf star Sirius B, a companion of Sirius, through an 18.5-inch (47 cm) telescope now located at Northwestern University.
1862 - Alvan Graham Clark menemukan bintang katai putih Sirius B, tetangga Sirius, dengan teleskop 18,5 inci yang sekarang ada di Universitas Northwestern.