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Overlay graphic of images taken by the Hubble Space Telescope

To find Kuiper Belt objects (KBOs) reachable by NASA’s New Horizons spacecraft, the Hubble Space Telescope took a total of 830 images of 83 pieces of sky (“fields”), covering an area similar to the size of the full moon. In this graphic, each pair of blue rectangles shows the size and position of a single Hubble field.  The pair of rectangles represents the twin CCD detectors of the Hubble Wide-Field Camera 3 (WFC3) used for the survey. The white stars show the approximate positions where three KBOs that are potentially reachable by New Horizons were discovered. The purple outline shows the Hubble field containing object “PT1,” and the red outline shows the tiny fraction of that field in which PT1 was found. A combination of five images shows PT1 (circled) moving against the star background.

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Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

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