was first observed on the night of 17 April 1999, by astronomers using the 4-meter Nicholas U. Mayall Telescope at Kitt Peak National Observatory in Arizona. Five additional objects were discovered on the same weekend: , ,  (Deucalion),  and .
was first seen on the night of 17 April 1999, by astronomers employing the 4-meter Nicholas U. Mayall Telescope at Kitt Peak National Observatory in Arizona. Furthermore, five additional celestial bodies were discovered during the same weekend: , ,  (Deucalion),  and .