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Loading contentA fundamental reference frame published in 1988, giving precise positions and proper motions for 1,535 bright stars on the equinox and epoch J2000. FK5 was the optical standard of its era, but it rested on a limited number of stars; it was superseded when the ICRS, realised by Hipparcos and later Gaia, replaced star-based frames with an extragalactic one.
Facts on this topic will be cited from these primary and reference sources.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.