How bright is Asteroid 11 Parthenope?
The current visual magnitude of Asteroid 11 Parthenope is 9.47. Given its brightness, Asteroid 11 Parthenope should be visible with the help of a binocular with a 50mm aperture, easy with a small telescope.
The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 11 Parthenope, 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.