Editing Pluto (section)

=== Observation ===
[[File:Pluto animiert 200px.gif|thumb|upright=1|Computer-generated rotating image of Pluto based on observations by the [[Hubble Space Telescope]] in 2002–2003]]
Pluto's distance from Earth makes its in-depth study and [[Space exploration|exploration]] difficult. Pluto's visual [[apparent magnitude]] averages 15.1, brightening to 13.65 at perihelion.<ref name="Pluto Fact Sheet" /> To see it, a telescope is required; around 30&nbsp;cm (12&nbsp;in) aperture being desirable.<ref name="SSC2002" /> It looks star-like and without a visible disk even in large telescopes,<ref>{{cite web |title=How to Scope Out Pluto in the Night Sky Friday |url=https://www.space.com/26426-pluto-telescope-skywatching-friday.html |website=Space.com |access-date=April 6, 2022 |language=en |date=July 3, 2014 |archive-date=April 6, 2022 |archive-url=https://web.archive.org/web/20220406093459/https://www.space.com/26426-pluto-telescope-skywatching-friday.html |url-status=live }}</ref> because its [[angular diameter]] is maximum 0.11".<ref name="Pluto Fact Sheet" />

The earliest maps of Pluto, made in the late 1980s, were brightness maps created from close observations of eclipses by its largest moon, Charon. Observations were made of the change in the total average brightness of the Pluto–Charon system during the eclipses. For example, eclipsing a bright spot on Pluto makes a bigger total brightness change than eclipsing a dark spot. Computer processing of many such observations can be used to create a brightness map. This method can also track changes in brightness over time.<ref name="YoungBinzelCrane2001" /><ref name="BuieTholenHorne1992" />

Better maps were produced from images taken by the [[Hubble Space Telescope]] (HST), which offered higher [[angular resolution|resolution]], and showed considerably more detail,<ref name="Buie_web_map" /> resolving variations several hundred kilometers across, including polar regions and large bright spots.<ref name="Buie_2010 surface-maps" /> These maps were produced by complex computer processing, which finds the best-fit projected maps for the few pixels of the Hubble images.<ref name="Buie_mapmaking" /> These remained the most detailed maps of Pluto until the flyby of ''New Horizons'' in July 2015, because the two cameras on the HST used for these maps were no longer in service.<ref name="Buie_mapmaking" />