(Near-Earth Object Surveillance Satellite, NESS, Near Earth Space Surveillance)
(small spacecraft tracking NEOs)
NEOSSat (for Near-Earth Object Surveillance Satellite)
is a small (15-cm aperture) Canadian (CSA)
space telescope, largely modeled after the MOST satellite,
but with the mission of discovering and tracking near-Earth objects
(a mission termed NESS for Near Earth Space Surveillance,
which was an earlier name for the satellite),
along with a second mission to survey Earth
satellites for security purposes
(termed HEOSS, for High Earth Orbit Space Surveillance).
NEOSSat was launched in 2013 and is still in operation as of 2025.