coordinates of observation point N39º W9.4ª time of event: about 21h50 GMT event duration: less than 1 minute was watching and admiring the moon located above the horizon line and the night sky, the weather was clear.One "star" called my attention due to its brightness (located maybe 30º above the moon), I tried to focus on it when suddenly it became much more brighter and brighter (maybe 1 or 2 sec event) and it started moving with an incredible speed, loosing its brightness into space I suppose, till I loose its sight (10 - 15 sec event).Been trying to rationalize and only explanation I can find it had to be a UFO.