Thursday, October 18, 2012 approximately 2:12 p.m. Arizona time I observed, while looking through a pair of Canon binoculars, an off-white disk-shaped object in the northern sky over the Santa Catalina Mountains in Tucson. It did not move from the location but banked several times while holding its position. I watched this object for approximately 6 minutes and when I turned to look for someone else to show the object to, it was gone.Friday, October 12, 2012 at approximately 4:11 p.m. Arizona time I observed an object, again in the northern sky over the Santa Catalina Mountains of Tucson. Looking at it with only the naked eye, I could only tell the object appeared round in shape and did not move from the location for approximately 3-4 minutes. It disappeared for a about 2 minutes, then reappeared further north next to a wispy cloud for about 3 minutes or so then disappeared.