Ephemeris data providing the positions and velocities of celestial bodies is a fundamental requirement for calculating interplanetary trajectories and spacecraft navigation, though it is a matter of basic astrodynamics and everyday engineering observation rather than requiring specific citation of the retrieved papers.
The claim that ephemeris data is required for interplanetary trajectory calculations is a matter of basic domain knowledge in astrodynamics and aerospace engineering. None of the retrieved papers specifically test or validate this foundational principle; instead, they discuss specific space missions (like IMAP, TRACERS, Europa Clipper, Psyche), instruments, or mission-specific algorithms without treating the necessity of ephemeris data as an open research question. Therefore, the claim is classified as common knowledge, and no citation is needed from the retrieved set.