Reviewed plan of the ALR, the laser rangefinder for the ASTER deep space mission to the triple asteroid 2001-SN263

The Brazilian deep space mission ASTER plans to send a small spacecraft to investigate the triple asteroid 2001-SN263. The launch is expected to occur in June, 2020. The main motivation of the mission is the development of technology and expertise to leverage the national space sector. The main scientific goal is the investigation of the triple asteroid 2001-SN263. To aggregate the widest possible Brazilian involvement in all mission sectors, some instruments for the mission are planned to be developed in partnership among Brazilian institutions. In this effort, a preliminary design of a laser altimeter to meet the mission needs was created and presented in 2010–2011. Since then, many studies were conducted and new information on the target asteroid was gathered. To take this into account, a review of that plan was conducted and the current results for the instrument design parameters are presented. (paper)