Orbital Observation and Robotic Surface Interaction Strategy for 433 Eros: A Theoretical Feasibility Study

This preprint presents a theoretical feasibility study of a dual-mode mission architecture for the near-Earth asteroid 433 Eros. The proposed framework combines a low-altitude science orbit with the deployment of an anchored or tethered robotic surface probe. Using physical parameters derived from the NEAR Shoemaker mission, we analyze orbital stability under strong J2 and C22 perturbations, evaluate synchronous orbit feasibility, estimate delta-v requirements, and model surface anchoring mechanics under micro-gravity conditions (~0.005 m/s² effective gravity). A simplified regolith penetration model and subsurface telemetry attenuation analysis at MHz frequencies are also presented. The results indicate that while a true geostationary orbit is dynamically unstable due to irregular mass distribution, a controlled frozen science orbit combined with surface anchoring is theoretically viable and risk-reducing. This work is a theoretical analysis and does not represent an official space agency mission proposal.