Neptune

21:00 BST on 30 September

Constellation: Aquarius Magnitude: +7.8

AM/PM: PM

The Solar System’s other ice giant, Neptune, comes to opposition on 11 September, when it will be at its brightest for the year. Unfortunately that’s not saying much – at a distance of 4.3 billion kilometres (2.6 billion miles), Neptune is so far away that it appears rather faint even when at its best.