I analyse a lot of online images, but I am not proficient with the ins and outs of lens flares. Literally know the basics.
Is the object in the sky in this photo a flare due to the shining headlight?
Photography Stack Exchange is a question and answer site for professional, enthusiast and amateur photographers. It only takes a minute to sign up.Sign up to join this community
The artifact is an inverted and reversed reflection of the bright headlight exactly opposite across the center of the frame (of the original, uncropped image) from the artifact. This is a type of lens flare known as ghosting
For more about ghosting, please see the following questions/answers here at Photography SE:
is it normal to get significant lens flare with a 50mm f/1.8 prime lens?
What could cause this visible artifact which seems to a be a glowing inverse of something outside of the frame overlayed on this photograph?
Does high reflectiveness of digital sensor lead to poor lens performance?
What is the blue circle in this moon image?
This answer to the last question linked above explains the differences in color between very bright light sources and their much dimmer reflections.
For an example of how exposure level can affect ghosting and other types of lens flare, please see this answer to Can you photograph the milky way with a full moon out?