Düsseldorf-Bilk Observatory

Between 1852 and 1890, C. Robert Luther discovered 24 asteroids there, from Thetis, discovered on April 17, 1852, to Glauke, discovered February 20, 1890. These asteroids and planetoids are called the 24 Düsseldorf planets. The asteroid 4425 Bilk is named in honour of the observatory.†

Near its original location, a benchmark was erected, displaying the observatory's burnt-out telescope.