Venus and Saturn conjunction

On January 16 I took this single image of Venus and Saturn close to conjunction. Venus is obvious, Saturn is close at about the 10 o'clock position. Further up in the left corner there is a blue dot which may be Neptune. I could not see this with my naked eye but noticed it after post processing. Did a little research and found that Neptune was about in that location. Was hoping someone could confirm or deny that the blue dot in the upper left corner is Neptune or not.

Pentax K-5 camera, Pentax 43mm lens, Starscape filter, iso 800, 8 second exposure at f/2.8.

Cropped and brightness added in Microsoft software. Noise reduction in Topaz.