This uncertainty is related to several parameters used in the orbit determination process including the number of observations (measurements), the time spanned by those observations (data arc), the quality of the observations (e.g. radar vs optical), and the geometry of the observations.
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Zaitsev is also responsible for initiating the world's first intercontinental radar astronomy experiment, 70-m dish of the Goldstone Deep Space Communications Complex to 70-m dish of the EPR observations of 6489 Golevka in June 1995.
Aleksandr Leonidovich Zaitsev (born 1945), Russian scientist in radar astronomy and SETI