Cygnus X-3 radio source - Lower limit on size and upper limit on distance.
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Hinteregger, H. F.↗
Engineering topics
Ergas, R. A.
Publications and source records attributed to Ergas, R. A..
Precision geodesy via radio interferometry.
Very-long-baseline interferometry experiments, involving observations of extragalactic radio sources, were performed in 1969 to determine the vector separations between antenna sites in Massachusetts and West Virginia. The 845.130-kilometer baseline was estimated from two separate experiments. The results agreed with each other to within 2 meters in all three components and with a special geodetic survey to within 2 meters in length; the differences in baseline direction as determined by the survey and by interferometry corresponded to discrepancies of about 5 meters. The experiments also yielded positions for nine extragalactic radio sources and allowed the hydrogen maser clocks at the two sites to be synchronized.
Hinteregger, H. F.↗