Abstract
The study of orbital conjunctions between space bodies is of fundamental importance in space situational awareness programs. The identification of potentially dangerous conjunctions, either between Near Earth Objects and our planet, or space debris and operative spacecraft, is most commonly done by looking at the distance between the objects in a given time window. A method based on Taylor models and Taylor differential algebra is presented to compute the time and distance of closest approach and to assess the effect that uncertainties on initial orbital parameters produce on these quantities.