 In January 2005, the re-analysis revealed Eris's slow motion against the background stars.Follow-up observations were then carried out to make a preliminary determination of Eris's orbit, which allowed the object's distance to be estimated.The team had planned to delay announcing their discoveries of the bright objects Eris and until further observations and calculations were complete, but announced them both on July 29 when the discovery of another large TNO they had been tracking, , was controversially announced on July 27 by a different team in Spain.