The study of small bodies of the solar system (asteroids, comets, satellites) is fundamental both for our understanding of the formation of the solar system and for characterising the risk of a near-Earth object impacting the Earth.
BIRDY
Knowledge of the internal structure of small bodies - from a few tens of meters to a few kilometers in size - is a key element. Nanosatellites offer a new opportunity to determine the mass (density, porosity, mass distribution, etc.) of these small bodies using relative measurements taken in close proximity. In particular, radio-science and orbit determination techniques are promising if we exploit the possibilities offered by the links (radio and optical ISL) between several satellites. New concepts are also being developed to reduce operating costs and the complexity of this type of mission, thanks to on-board orbit determination (IFOD). The goal of BIRDY is to be an accompanying nanosatellite for future interplanetary exploration missions, or to act as a reconnaissance mission to a (potentially) hazardous asteroid. The BIRDY team is currently building RF and IFOD test benches. A possible scientific mission would target the passage of the asteroid Apophis near Earth in 2029. The BIRDY team is led to Paris Observatory by IMCCE with a contribution from LESIA and CENSUS.
