ug123UG-123 from Bimba at RS. Description. Cylinder, Ultran Rodless Gold Coupling Strength; 1-14In Bore 12; Stroke: 3500604 (2012 UG123) is a mid-sized asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified 2012 UG123 as potentially hazardous