Dust Science with the DESTINY+ Dust Analyzer

The DESTINY+spacecraft (Demonstration and Experiment of Space Technology forINterplanetary voYage with Phaethon fLyby and dUst Science) will be launched to theactive asteroid (3200) Phaethon by the Japanese Space Agency JAXA in 2024. The mainmission target will be Phaethon with a close flyby in 2028. Together with two cameras, theDESTINY+ Dust Analyzer (DDA) on board will perform close observations of this rockcomet type object to solve essential questions related to the evolution of our inner SolarSystem, especially the heating processes of small bodies. Phaethon is believed to be theparent body of the Geminids meteor shower and is considered to be a comet-asteroidtransition object. Such objects likely play a major role to better understand the nature andorigin of mass accreted on to Earth. The DDA dust analyzer is an upgrade of the CassiniCosmic Dust Analyzer (CDA) which very successfully investigated the dust environment ofthe Saturnian system. The DDA instrument is an impact ionization time-of-flight massspectrometer with integrated trajectory sensor, which will analyse sub-micrometer andmicrometer sized dust particles. The instrument will measure the particle composition (massresolution m/Δm ≈ 100-150), mass, electrical charge, impact velocity (about 10% accuracy),and impact direction (about 10° accuracy). In addition to dust analysis in the vicinity ofPhaethon during the close flyby at this small asteroid, DDA will continuously measure dustin interplanetary space in the spatial region between 0.9 and 1.1 AU during theapproximately four years spanning cruise phase from Earth to Phaethon. We give a progressreport of the instrument development together with an update on the preparation of thescientific measurements planned during the DESTINY+ mission.