Dates for your saved location. Each year the planet slips behind the Sun’s glare for a few weeks, then reappears in the morning sky.

Pluto was the ninth planet from its discovery in 1930 until 2006, when it was reclassified as a dwarf planet — one of the largest members of the Kuiper Belt. In 2015 NASA’s New Horizons flew past and transformed it from a fuzzy dot into a world: nitrogen-ice glaciers, water-ice mountains, and a vast pale heart-shaped region now called Tombaugh Regio.

At about magnitude 14.5 Pluto is far beyond naked-eye, binocular, or small-telescope reach — spotting it takes a 10-inch or larger telescope, a truly dark sky, and a detailed finder chart, and even then it is just a faint point that you confirm by watching it shift against the stars over several nights. It is a target you hunt rather than simply see.