999 Zachia is a

main-belt asteroid The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

that was discovered by German astronomer Karl W. Reinmuth in 1923 and named after Hungarian astronomer

Franz Xaver von Zach Baron Franz Xaver von Zach (''Franz Xaver Freiherr von Zach''; 4 June 1754 – 2 September 1832) was a Hungarian astronomer born at Pest, Hungary (now Budapest in Hungary). Biography Zach studied physics at the Royal University of Pest, and s ...

. Photometric observations of this asteroid collected during 1999 show a

rotation period The rotation period of a celestial object (e.g., star, gas giant, planet, moon, asteroid) may refer to its sidereal rotation period, i.e. the time that the object takes to complete a single revolution around its axis of rotation relative to the ...

of 22.77 ± 0.03 hours with a brightness variation of 0.3

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

References

External links

Lightcurve plot of 999 Zachia
Palmer Divide Observatory, B. D. Warner (1999)
Asteroid Lightcurve Database (LCDB)
query form

Dictionary of Minor Planet Names
Google books

– Observatoire de Genève, Raoul Behrend

– Minor Planet Center * * 000999 Discoveries by Karl Wilhelm Reinmuth Named minor planets 19230809 {{beltasteroid-stub vec:Lista de asteroidi#999 Zachia