5 Asteroid To Close Approach Earth On May 5, 2020 | Asteroid Tracking This video describes the limits placed on the Near Earth Objects close-approach data.
Perhaps the most important issue to remember when interpreting NEO close-approach data is the inherent uncertainty in each NEO orbit. This uncertainty is related to several parameters used in the orbit determination process including the number of observations (measurements), the time spanned by those observations (data arc), the quality of the observations (e.g. radar vs optical), and the geometry of the observations.
Of these parameters, the time spanned by the observations generally has the greatest effect on orbital uncertainty. Although these limits could be refined, they are sufficiently conservative to exclude any highly uncertain Earth close-approaches.
(2020 HS9) 2020-May-05 07:33 0.01176 23 m – 52 m
(2020 HR8) 2020-May-05 10:01 0.02306 11 m – 24 m
(2020 HZ6) 2020-May-05 10:32 0.02579 25 m – 56 m
(2020 HL) 2020-May-05 15:24 0.0422727 m – 59 m
(2020 HF7) 2020-May-05 17:05 0.0235616 m – 37 m