How bright is Asteroid A/2017 U7?
The current visual magnitude of Asteroid A/2017 U7 is 17.62. Given its brightness, Asteroid A/2017 U7 should be visible only through long exposure photography.
The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid A/2017 U7, 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 Asteroid A/2017 U7 between
January 2013 and December 2100