Unfortunately, Piazzi had only been able to observe 9 degrees of its orbit before it disappeared behind the Sun. Zach published several predictions of its position, including one by Gauss which differed greatly from the others.
Sa kasamaang palad, Piazzi had lamang ay makapag-obserba 9 degree ng kanyang orbita bago ito nawala sa likod ng Linggo. Zach-publish ng ilang mga paghuhula ng kanyang posisyon, kasama na ang isa sa pamamagitan ng gauss na differed malaki mula sa iba.