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

^aComputed from the volumes of the shape models, not the volumes of triaxial ellipsoids with the extents listed above.