Abstract
This paper proposes a "tethered sampler" method to be performed in an asteroid exploration mission. In this method, a sampler tethered to a hovering mothership is set to collide with an asteroid. Upon collision, the corer (collector) at the sampler tip is implanted in the asteroid to collect layered samples. Then, the corer is extracted using the tension of the tether. Focusing on the implantation and extraction phases, this research team has conducted experimental analyses on the resistive load during corer extraction, as well as and numerical and experimental analysis on the effect of the angle of attack α (between the corer’s positional and velocity vectors) on the penetration depth. We have also devised measures to counter issues that will arise in the extraction phase. To reduce the resistance load during extraction, a dual-core mechanism was developed and its effectiveness confirmed with a principle model. In addition, to prevent the sample from falling off during extraction, we devised the "Yubihabu" gripping mechanism, which is modeled after a traditional Okinawan toy, Yubihabu. Its basic operational characteristics were also verified. The results of these analyses have yielded numerous findings that will be effective in realizing the "tethered sampler" method.
