Inkastoo shaqada ay ka dhigan tahay hoos u dhaca Johann, waxa uu siiyey helitaanka cusub 27-inch (690 mm) refractor, telescope ugu weyn ee dunida ee wakhtigaas. By this barta Johann horey u helay 27 asteroids, oo uu isticmaali lahaa Vienna 27-inch (690 mm) iyo 12-inch (300 mm) qalabka si aad u hesho dheeraad ah 94 asteroids ka hor inta uu ka fariistay. Waxaa ka mid ah uu discoveries ahaa asteroid 253 Mathilde, helay on November 12, 1885.
27 iyo