Apparent close approaches between near-Earth asteroids and quasars - Precise astrometry and frame linking

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Table 1:

UCAC2 stars in 10 $\hbox {$^\prime $ }\times 10\hbox {$^\prime $ }$ fields around quasars from ICRF-Ext2, VCS, and VLA catalogs.
	UCAC2 Stars			$\sigma_\alpha$ (mas)		$\sigma_\delta$ (mas)
	<4	4-10	>10	<30	>30	<30	>30
ICRF-Ext2	123	168	425	360	249	404	205
VCS	622	761	1972	1620	1190	1863	947
VLA	401	348	951	756	581	848	489

The first 3 columns represent the number of quasars fields with the given number of stars from UCAC2 catalog. The next 4 columns denote the number of fields with the average positional errors of the UCAC2 stars <30 mas and >30 mas.

Source LaTeX | All tables | In the text

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