Hayabusa2 Extended Mission: New Voyage to Rendezvous with a Small Asteroid Rotating with a Short Period

Abstract

Hayabusa2 is the Japanese Asteroid Return Mission and targeted the carbonaceous asteroid Ryugu, conducted by the Japan Aerospace Exploration Agency (JAXA). The goal of this mission was to conduct proximity operations including remote sensing observations, material sampling, and a Small Carry-On Impact experiment, as well as sample analyses. As of September 2020, the spacecraft is on the way back to Earth with samples from Ryugu with no critical issues after the successful departure in November 2019. Here, we propose an extended mission in which the spacecraft will rendezvous with a small asteroid with ~30 m - ~40 m in diameter that is rotating at a spin period of ~10 min after an additional ~10-year cruise phase. We introduce that two scenarios are suitable for the extended mission. In the first scenario, the spacecraft will perform swing-by maneuvers at Venus once and Earth twice to arrive at asteroid 2001 AV43. In the second scenario, it will perform swing-by maneuvers at Earth twice to reach asteroid 1998 KY26. In both scenarios, the mission will continue until the early 2030s. JAXA recently released the decision that the spacecraft will rendezvous with 1998 KY26. This paper focuses on our scientific assessments of the two scenarios but leaves the decision process to go to 1998 KY26 for future reports. Rendezvous operations will be planned to detail the physical properties and surrounding environments of the target, one of the smallest elements of small planetary bodies. By achieving the planned operations, the mission will provide critical hints on the violent histories of collisions and accumulations of small bodies in the solar system. Furthermore, the established scientific knowledge and techniques will advance key technologies for planetary defense.

51 pages, 9 figures, and 10 tables. The article is in press in Advances in Space Research

References in corpus (12)

• Spitzer Secondary Eclipses of the Dense, Modestly-irradiated, Giant Exoplanet HAT-P-20b Using Pixel-Level Decorrelation
• A Consistent Study of Metallicity Evolution at 0.8 < z < 2.6
• Stress and Failure Analysis of Rapidly Rotating Asteroid (29075) 1950 DA
• Constraints on the Physical Properties of Main Belt Comet P/2013 R3 from its Breakup Event
• KELT-19Ab: A P~4.6 Day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companion
• Spin-driven evolution of asteroids' top-shapes at fast and slow spins seen from (101955) Bennu and (162173) Ryugu
• Equatorial jet in the lower to middle cloud layer of Venus revealed by Akatsuki
• The January 7, 2015, superbolide over Romania and structural diversity of meter-sized asteroids
• The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process
• The spatial distribution of impact craters on Ryugu
• Mass shedding activities of Asteroid (3200) Phaethon enhanced by its rotation
• Constraints on the perturbed mutual motion in Didymos due to impact-induced deformation of its primary after the DART impact

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