葉凱士天文台
An example of an asteroid discovered at Yerkes is 1024 Hale, provisional designation , a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately in diameter. The asteroid was discovered on 2 December 1923 by Belgian–American astronomer George Van Biesbroeck at Yerkes Observatory, and it was named for astronomer George Ellery Hale of Yerkes Observatory fame. Some additional examples include 990 Yerkes, 991 McDonalda, and 992 Swasey around this time; many more minor planets would be discovered at the observatory in the following decades.