10000 Myriostos is a main belt asteroid. It was discovered by A. G. Wilson on September 30 1951 at the Palomar Observatory on Palomar Mountain, California.
Given the provisional designation 1951 SY, it was renamed "(10000) Myriostos" (Greek for "ten thousandth") to honour all astronomers who help discover ten thousand such bodies. This occurred after some debate as to whether Pluto should have been reclassified as a minor planet and given the number 10000, with strong resistance coming from the American Astronomical Society's Division for Planetary Sciences.