A stationary object, very bright, emitting a spectrum of colors with radiating points.

Around 23:00, my boyfriend and I noticed a very bright “star” appearing object out my window.  This object was significantly bigger and brighter than all of the stars around it.  It was also emitting a spectrum of colors and was changing.  It appeared similar in shape to an asterisk with clear lines of light being emitted from all points.
As this report sounds similar to a Star, we used two different sky map apps to determine which star.  Although Sirius is close in sky to where this object was, you could see Sirius to the left.  In order to further investigate, we checked the stars again this evening around the same time and did not see the same object in the position which further proved the object was not a star.
Of note, I am in the medical field and am very scientific minded.  My boyfriend has a background in electronic media and math.  This being said, we are both objective people who rule out common things prior to jumping to the conclusion of UFO.