«Each faint asteroid must be captured in many separate exposures for computers to distinguish it from numerous other asteroids and then piece together its orbit,» he explains. (discovermagazine.com)
Hubble Image (inset image): This image is a composite of separate exposures acquired by the ACS instrument on HST. (hubblesite.org)
These images are a composite of separate exposures acquired by the ACS / WFC instrument on the Hubble Space Telescope. (hubblesite.org)