How bright is Pluto?
The current visual magnitude of Pluto is 14.55. Given its brightness, Pluto should be visible with the help of a telescope having an aperture of 14 inches (350mm) or more.
The following chart is the predicted light curve (visual magnitude as a function of time) of Pluto, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.
Predicted magnitude of Pluto between
January 1900 and December 2099