page_title: Clyde Tombaugh
section_title: Asteroids discovered
hierarchical_section_title: Clyde Tombaugh / Asteroids discovered
caption_attribution_description: English: A Carl Zeiss Jena blink comparator at Lowell Observatory, used in the discovery of Pluto. Čeština: Tzv. blink komparátor, s jehož pomocí byl na Lowellově observatoři ve Spojených státech objeven Pluto.
context_page_description: Clyde William Tombaugh was an American astronomer. He discovered Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt. At the time of discovery, Pluto was considered a planet but was later reclassified as a dwarf planet in 2006. Tombaugh also discovered many asteroids. He called for the serious scientific research of unidentified flying objects, or UFOs.
context_section_description: Tombaugh is officially credited by the Minor Planet Center with discovering 15 asteroids, and he observed nearly 800 asteroids during his search for Pluto and years of follow-up searches looking for another candidate for the postulated Planet X. Tombaugh is also credited with the discovery of periodic comet 274P/Tombaugh–Tenagra. He also discovered hundreds of variable stars, as well as star clusters, galaxy clusters, and a galaxy supercluster.
caption: Tombaugh compared his photographic plates using this blink comparator.
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