Arguably his greatest achievement was the introduction of the use of wide-field photographic methods to study the structure of the Milky Way.
Using the Lick refractor, he made the first photographic discovery of a comet and discovered Amalthea, the fifth known moon of Jupiter. Arguably his greatest achievement was the introduction of the use of wide-field photographic methods to study the structure of the Milky Way. The discoverer of the star with the largest known proper motion, FTP, name this man whose eponymous star is a mere 6 light years away.
Using the Lick refractor, he made the first photographic discovery of a comet and discovered Amalthea, the fifth known moon of Jupiter.
Edward Emerson Barnard