Neptune at Opposition

September 9 – Neptune at Opposition. The blue giant planet will be at its closest approach to Earth and its face will be fully illuminated by the Sun. It will be brighter than any other time of the year and will be visible all night long. This is the best time to view and photograph Neptune. Due to its extreme distance from Earth it will only appear as a tiny blue dot in all but the most powerful telescopes.

Source: http://www.seasky.org/astronomy/astronomy-calendar-2019.html