NASA plans a November 2024 launch three months after its new moonship returned to Earth.
NASA says asteroid 2023 DW is 162 feet wide and takes 271 days to cycle the sun.
According to Tuesday's agency study, new objects need weeks of data to predict their future paths.
Asteroid 2023 DW, which tops NASA's Earth impact tracking list, shouldn't worry the public.
NASA orbit analysts will watch the asteroid and update predictions as data arrives.
Near-Earth objects are space objects within 30 million miles of Earth.
NASA monitors 90% of NEOs over 140 metres. NASA discovered 40% of these comets.
If an asteroid neared, the PDCO would alert the government and people.
Ground-based telescopes show Dimorphos circle the larger asteroid in 11 hours and 32 minutes.