On September 26, 2022, NASA's Double Asteroid Redirection Test (DART) mission successfully impacted the small moon of asteroid Didymos . The primary goal of the mission was to test the feasibility of using a kinetic impactor to change the orbit of an asteroid in space. The impact was highly effective, resulting in a change in Dimorphos' orbit around Didymos by ~33 minutes . Large amounts of ejecta were observed from ground- and space-based telescopes, and from the LICIACube spacecraft , which was deployed from DART before its impact. The deflection efficiency of an asteroid can be quantified in terms of a parameter called ?, which is the ratio of the momentum of the impactor to the recoil momentum of the target. The impact outcome strongly depends on the surface, subsurface and internal properties . In order to better understand the target properties and structure of Dimorphos, we used empirical scaling relationships based on laboratory experiments and previous numerical simulations as well as new numerical simulations using the Bern SPH shock physics code to model the impact outcome and compare it with observations.
LOW STRENGTH OF ASTEROID DIMORPHOS AS DEMONSTRATED BY THE DART IMPACT
A Rossi;
2023
Abstract
On September 26, 2022, NASA's Double Asteroid Redirection Test (DART) mission successfully impacted the small moon of asteroid Didymos . The primary goal of the mission was to test the feasibility of using a kinetic impactor to change the orbit of an asteroid in space. The impact was highly effective, resulting in a change in Dimorphos' orbit around Didymos by ~33 minutes . Large amounts of ejecta were observed from ground- and space-based telescopes, and from the LICIACube spacecraft , which was deployed from DART before its impact. The deflection efficiency of an asteroid can be quantified in terms of a parameter called ?, which is the ratio of the momentum of the impactor to the recoil momentum of the target. The impact outcome strongly depends on the surface, subsurface and internal properties . In order to better understand the target properties and structure of Dimorphos, we used empirical scaling relationships based on laboratory experiments and previous numerical simulations as well as new numerical simulations using the Bern SPH shock physics code to model the impact outcome and compare it with observations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
