Saucer shaped object

Object was spotted approaching from the West, by my Mother, she thought it was strange, we both went to the front porch, and looked to the south west, and we froze as a Saucer shaped object rose above the next door neighbors house. The object made no noise, and was lit on the bottom by 5 round lights. It had to have been at least a 100 ft in diamenter, and proceeded east.  We were both scared at first, then felt no fear as the object continued east. we watched as it neared the eastern horizon, it suddenly turned south, darted and disapeared.
Date may be approximate.  Witness describes self as professional, with considerable technical background in more than one field.  PD