Precise Radio Source Positions: A Comparison of Two Independent Lists

Abstract

MEASUREMENTS of radio source positions to an intended accuracy of 1 arc second or better have recently been carried out independently at the National Radio Astron-cm), although the actual methods which were use Both sets of observations were done by means of interferometry at a nominal frequency of 2,695 MHz (λ 11.1 cm), although the actual methods which were employed differ radically. The positions measured for the twenty-eight sources common to the two lists are generally in excellent agreement, as will be shown. Papers describing the methods used, and containing full lists of measured positions, will be published separately elsewhere (ref. 1 and unpublished work of Adgie et al.).