A radar package for asteroid subsurface investigations: Implications of implementing and integration into the MASCOT nanoscale landing platform from science requirements to baseline design

• Published in: Acta astronautica 2019-03, Vol.156, p.317-329
• Main Authors: Herique, Alain, Plettemeier, Dirk, Lange, Caroline, Grundmann, Jan Thimo, Ciarletti, Valerie, Ho, Tra-Mi, Kofman, Wlodek, Agnus, Benoit, Du, Jun, Fa, Wenzhe, Gassot, Oriane, Granados-Alfaro, Ricardo, Grygorczuk, Jerzy, Hahnel, Ronny, Hoarau, Christophe, Laabs, Martin, Le Gac, Christophe, Mütze, Marco, Rochat, Sylvain, Rogez, Yves, Tokarz, Marta, Schaffer, Petr, Vieau, André-Jean, Biele, Jens, Buck, Christopher, Gil Fernandez, Jesus, Krause, Christian, Suquet, Raquel Rodriguez, Ulamec, Stephan
• Format: Article
• Language: English
• Subjects: AIDA/AIM; Asteroid; Asteroid collisions; Asteroid impact; Asteroids; Astrophysics; Heterogeneity; Instrumentation; Instrumentation and Methods for Astrophysic; Japanese spacecraft; MASCOT lander; Mascots; Mineralogy; Near-Earth Objects; Planetary defense; Radar; Radar sounding; Radar tomography; Regolith; Remote sensing; Sciences of the Universe; Stratigraphy; Subsurface investigations
• ISSN: 0094-5765; 1879-2030
• DOI: 10.1016/j.actaastro.2018.03.058

The internal structure of asteroids is still poorly known and has never been analyzed directly by measurements. Our knowledge relies entirely on inferences from remote sensing observations of the surface and theoretical modeling. Direct measurements are crucial to characterize an asteroid's internal structure and heterogeneity from sub-metric to global scale. The radar package developed in the frame of the phase A/B1 of the Asteroid Impact Mission (AIM) as part of the larger Asteroid Impact & Deflection Assessment (AIDA) mission is a mature instrument suite to answer this question and to improve our ability to understand and model the mechanisms driving Near Earth Asteroids (NEA). It is of main interest for science, exploration and planetary defense. This instrument suite consists of a monostatic high frequency radar (HFR) to investigate the stratigraphy of surface regolith and a bistatic low frequency radar (LFR) to characterize the deep interior. The chosen platform to deliver the surface unit of the LFR and other instruments for a close-up study of the target asteroid is the MASCOT nanolander, which already flies on Hayabusa2 (HY2) in a mineralogy scout configuration. In this paper, we present the chosen instrumentation for radar science, baseline mission requirements and the initial design for integration into the lander platform, including all peculiarities and constraints. •Direct observations of asteroids by radar to understand accretion and evolution.•The baseline design of two radars is derived from mission science requirements.•Surface and subsurface maps are provided by a monostatic high frequency radar.•Deep interior 2D and 3D tomography is provided by a bistatic low frequency radar.•Aspects of integrating the bistatic radar onto the reusable MASCOT lander platform.