Using Asteroid Early Orbital Data for Rapid Mars Missions.

Early orbital predictions of near-Earth asteroid 2001 CA21, particularly the 2015 JPL Horizons Solution #11, describe a highly eccentric trajectory with a well-defined sub-ecliptic orbital plane. Although later observational refinements altered the asteroid’s osculating elements, the early solution provides a geometrically structured orbital configuration that can be examined as a reference plane for heliocentric transfer analysis. This study investigates whether the orbital geometry of a preliminary small-body solution can function as a structured filtering framework for identifying rapid Earth–Mars transfer opportunities. Using short-way Lambert-based trajectory construction constrained to remain within of the CA21 orbital plane and high-fidelity JPL Horizons ephemerides, three Mars opposition windows (2027, 2029, and 2031) are analyzed. The 2031 opposition emerges as uniquely favorable under the CA21-plane constraint, yielding two outbound Earth Mars trajectories (33 and 56 days) and corresponding dynamically consistent return legs forming complete round-trip architectures of approximately 153 and 226 days total duration. Sensitivity analysis demonstrates that these CA21-anchored solutions remain geometrically stable under controlled boundary-state perturbations, and Monte Carlo re-evaluation confirms numerical robustness of the Lambert construction. While the asteroid itself is not used as a physical waypoint, its early orbital plane serves as a geometric template that highlights structured rapid-transfer corridors within the 2031 opposition geometry. This case study illustrates how the well-defined plane geometry of a preliminary small-body orbit can be employed as a methodological screening tool for rapid interplanetary transfer identification. • Paper: “Astrodynamics Innovation: Utilizing an Asteroid’s Early Orbital Data for Rapid and Round-Trip Mars Missions in 2031 Window” • Novel method uses early asteroid orbit for rapid Mars missions • Geometric plane anchoring guides rapid Earth–Mars transfers • Rapid round-trip Mars missions found for the 2031 window • Early orbital geometry used as transfer screening tool • Feasible rapid round-trip to Mars in 226 days