Table 1 Properties of the DART impact, Dimorphos and Didymos

Time of impact

26 September 2022 at 23:14:24.183 ± 0.004 utc

Impact speed (km s⁻¹)

6.1449 ± 0.0003

Impact angle (°)

73 ± 7 from local horizontal, 17 ± 7 from the surface normal

Impact site location (latitude, longitude)

8.84 ± 0.45° S, 264.30 ± 0.47° E

Impact site offset from centre of figure (m)

25 ± 1

Spacecraft mass at time of impact (kg)

579.4 ± 0.7

Impact kinetic energy (GJ)

10.94 ± 0.01

Extent of Dimorphos (m)

X: 177 ± 2

Y: 174 ± 4

Z: 116 ± 2

Extent of Didymos (m)

X: 849 ± 15

Y: 851 ± 15

Z: 620 ± 15

Volume of Dimorphos (km³)

0.00181 ± 10%

Diameter of volume-equivalent sphere for Dimorphos (m)^a

151 ± 5

Diameter of volume-equivalent sphere for Didymos (m)^a

761 ± 26

Mass of the Didymos system (kg)

(5.6 ± 0.5) × 10¹¹ 

Density of Didymos system (kg m⁻³)

2,400 ± 300 

Inferred mass of Dimorphos (kg)

4.3 × 10⁹