Observed a triangle shaped object with white exterior lights, tracking at approximately 1000-1200 ft in altitude at approximately 70 degrees to the horizon in a nw-se direction. object was slow moving, approximately one kilometre or less away from the witness, . object was estimated to be 125-150 ft wingtip to wingtip. white exterior lights were situated around the leading edge surfaces of the object, giving it a somewhat gray colouration.. duration of sighting was approximately one minute before it passed behind a mountain. sighting was outside, situated in cottage country in close proximity to mont. tremblant quebec. stellarium website suggests iss was in the region, but object observed was much too low to be considered a celestial object.