Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

P (Space and Planetary Sciences ) » P-CG Complex & General

[P-CG21] Future Missions and instrumentation for space and planetary science

Sun. May 26, 2019 1:45 PM - 3:15 PM A01 (TOKYO BAY MAKUHARI HALL)

convener:Mitsunori Ozaki(Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University), Satoshi Kasahara(The university of Tokyo), Shingo Kameda(School of Science, Rikkyo University), Kazuo Yoshioka(Graduate School of frontier Science, The University of Tokyo), Chairperson:Shingo Kameda, Mitsunori Ozaki(Kanazawa University)

2:25 PM - 2:45 PM

[PCG21-13] The concept of AI3 and impactors

★Invited Papers

*Koji Wada1, Jakob Deller2, Jessica Agarwal2, Hans Martin Braun3, Kieran Carroll4, Hannah Goldberg5, Martin Jutzi6, Özgür Karatekin7, Tomáš Kohout8, Sampsa Pursiainen9, Birgit Ritter7, Olaf Roders2, Francisco da Silva Pais Cabral10, Fredrik Sjoberg11, Mika Takala9, Esa Vilenius2, Patrick Bambach2, Ryo Ishimaru1, Yutaka WADA1, Masahiko Arakawa12, Takanao Saiki13 (1.Planetary Exploration Research Center, Chiba Institute of Technology, 2.Max Planck Institute, Göttingen, 3.RST Radar System Technik, 4.Gedex Systems Inc, 5.GOMSpace, 6.University of Bern, 7.Royal Observatory of Belgium, 8.University of Helsinki, 9.Tampere University of Technology, 10.GMV, 11.OHB, 12.Kobe University, 13.JAXA)

Keywords:Apophis, ESA F-Class, Rubble Pile Asteroids, CubeSats, PHAs, Impactor

"Asteroid In-situ Interior Investigation - 3way" (AI3) defines a mission to investigate the interior of a rubble pile asteroid with three different complementary measurements: radar tomography, determination of the gravity field, and seismic sounding. AI3 has been proposed to ESA F-Class call and passed the first selection.

A mothership serving as communication relay will carry 4 CubeSats in the orbit of asteroid Apophis, observing the PHA during its extremely close approach to earth in 2029, getting as close as 0.1 Lunar distances, which is within the geostationary orbit.

Depending on the elongated shape of Apophis the earth fly by will trigger dynamic events on the asteroid and allow for extremely high data rates during the observation.

Two identical DISCUS satellites will be deployed to leverage the multi-point approach enabled by CubeSat technology, taking radar measurements to reconstruct the interior using computed tomography as well as determining the gravity field and analyzing surface composition using a hyperspectral imager. After completing the characterization phase, one of the DISCUS satellites will descent to the surface and measure the local surface gravity at several points on the asteroid. In the final phase, two impacting CubeSats will generate seismic waves, to be detected by the DISCUS satellite on the surface. The impact will be observed in high spatial and temporal resolution to add important data for impact studies in a before unexplored energy regime.

The concept has recently been invited to submit a detailed proposal to the Phase-2 of the ESA F-Class call.