The Double Asteroid Redirection Test (DART) mission was the world's first planetary defense mission. After reaching the binary (65803) Didymos-Dimorphos asteroid system it hit the 160 m diameter secondary, Dimorphos, on September . Impacting at a speed of approximately 6 km s-1 it successfully demonstrated the kinetic impact deflection technique changing Dimorphos' orbital period about Didymos by about 0 min and creating a complex impact ejecta plume with filamentary structures in the process . These events were observed both from Earth and by DART's ride-along companion CubeSat, LICIACube. These observations will be used to determine and understand the momentum transfer efficiency of the impact . Calculating ejecta mass is critical to understanding momentum transfer. This requires an accurate knowledge of scattering properties including the ejecta particle size distribution. Analysis of LUKE brightness measurements at widely separated phase angles and in multiple colors comprise nearly independent measures for constraining the effective size of scattering particles. We have used LUKE RGB data to examine the spatial and temporal variation of effective particle size within the ejecta plume structure and filaments, as outlined below.
Scattering Properties of the DART Impact Plume: Phase Angle and Color Dependence
A Rossi;
2023
Abstract
The Double Asteroid Redirection Test (DART) mission was the world's first planetary defense mission. After reaching the binary (65803) Didymos-Dimorphos asteroid system it hit the 160 m diameter secondary, Dimorphos, on September . Impacting at a speed of approximately 6 km s-1 it successfully demonstrated the kinetic impact deflection technique changing Dimorphos' orbital period about Didymos by about 0 min and creating a complex impact ejecta plume with filamentary structures in the process . These events were observed both from Earth and by DART's ride-along companion CubeSat, LICIACube. These observations will be used to determine and understand the momentum transfer efficiency of the impact . Calculating ejecta mass is critical to understanding momentum transfer. This requires an accurate knowledge of scattering properties including the ejecta particle size distribution. Analysis of LUKE brightness measurements at widely separated phase angles and in multiple colors comprise nearly independent measures for constraining the effective size of scattering particles. We have used LUKE RGB data to examine the spatial and temporal variation of effective particle size within the ejecta plume structure and filaments, as outlined below.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
