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The Carnegie telescope is a 20-inch (510 mm) twin refractor telescope located at Lick Observatory in California, United States.

Carnegie telescope
Carnegie telescope dome, Aug 2019.jpg
Carnegie telescope dome
Part ofLick Observatory Edit this on Wikidata
Location(s)California, US
Coordinates37°20′33″N 121°38′17″W / 37.3426°N 121.638°W / 37.3426; -121.638Coordinates: 37°20′33″N 121°38′17″W / 37.3426°N 121.638°W / 37.3426; -121.638 Edit this at Wikidata
Telescope styleoptical telescope
reflecting telescope Edit this on Wikidata
Number of telescopesEdit this on Wikidata
Diameter20 in (0.51 m) Edit this at Wikidata
Carnegie telescope is located in the United States
Carnegie telescope
Location of Carnegie telescope

The Carnegie 20-inch (510 mm) twin refractor is located in a mid-sized dome at the observatory. Because the Carnegie is actually two 20-inch (510 mm) telescopes, side by side on a single mount, it looks more like a large set of very long binoculars rather than a telescope. One side is designed to photograph blue light and the other yellow light.

The Carnegie was built expressly to measure the motions of as many stars as possible in our local area of the Milky Way. Called the Lick Proper Motion Survey, the Carnegie's mission was to photograph the entire night sky twice; once in the 1950s and again 20 years later. By comparing both sets of photographs, much was learned about the motion of stars and the structure of our galaxy. The Carnegie is not used today except when photographs of a wide area of the sky are needed.