999 Zachia is a main-belt asteroid that was discovered by German astronomer Karl W. Reinmuth in 1923 and named after Hungarian astronomer Franz Xaver von Zach. Photometric observations of this asteroid collected during 1999 show a rotation period of 22.77 ± 0.03 hours with a brightness variation of 0.3 magnitude. References External links Lightcurve plot of 999 Zachia, Palmer Divide Observatory, B. D. Warner (1999) Asteroid Lightcurve Database (LCDB), query form (info) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 000999 Discoveries by Karl Wilhelm Reinmuth Named minor planets 19230809 vec:Lista de asteroidi#999 Zachia