UFO Sighting in Tacoma, Washington on 2017-07-27 22:00:00 - Light traveled slowly, was brighter than observed aircraft. no nav lights. observed 3 nights consecutive at 10pm 7/25-7/27

7/25 ~10pm: in my yard looking at stars. noticed a very bright light move from wsw to ese. observed with binoculars, but could not see a shape or navigation lights. object was brighter and moved slower than other aircraft observed. 7/26 ~10pm: same place. observed object matching description above. observed with binoculars with same results as above. 7/27 ~10pm: waited for object to appear. it passed over at roughly the same time as the other observed objects, but on a slightly more northerly track. again observed with binoculars, but could not see nav lights or the shape of the object. 7/28 9:45 10:15pm: waited for object, but it did not appear. my house is near an afb and flight paths to/from a large airport. i am used to seeing and observing aircraft flying at night. i have also observed what i took to be satellites and very high flying aircraft. this object was unusual in that it was roughly the brightness of venus, (which was not visible). it moved slower than aircraft and satellites that i've seen. it seemed to large and bright to be a satellite, and did not display navigation or other lights which i expect to see on aircraft. i expect that this is an aircraft of some kind, but the anomalies in its appearance have bothered me enough to try to find out what it was. can you help me? are there other resources that could help me identify it? thank you for your consideration.