I am not sure, but I am relatively certain that this is the reflection of a coronal discharge thruster that is rumored to be in common use by "them." I walked out of the front door and noticed this on the garage door. I was pretty certain that it couldn't be explained by the reflection of the early morning sun off the van windows since I keep them intentionally dirty so as not to attract attention as I drive through town. My understanding, from someone who has actually seen a coronal discharge thruster being tested (that would be me) is that the hue of the light is indicative of the power output level of the device. You will note that this one is quite close to white indicating high power output used for quick acceleration and cornering.
I looked around the sky for quite a while and was unable to detect the presence of the ship. I think that the sun was shining far to brightly and the ship was intentionally keeping itself between me and the sun. These guys are clever, they never miss a trick to remain undetected. My understanding is that they actually have detectors on the ship which can determine who, if anyone, is looking for them so that they can take appropriate evasive maneuvers. They had me pegged from the get-go. I went inside for a few minutes then ran quickly outside in the hope of catching them off guard, but no joy. They are far too nimble for the likes of me.