NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T09:43:47 PDT
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For refcode 1988AJ.....95.1647S:
Retrieve 127 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1988AJ.....95.1647S ASTROMETRIC RESULTS OF 1975-1985 DEEP SPACE NETWORK RADIO INTERFEROMETRY: THE JPL 1987-1 EXTRAGALACTIC SOURCE CATALOG O. J. SOVERS, C. D. EDWARDS, C. S. JACOBS, G. E. LANYI, K. M. LIEWER, AND R. A. TREUHAFT Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 Received 9 November 1987; revised 4 March 1988 ABSTRACT An astrometric radio reference frame has been determined from inter- continental dual-frequency radio interferometric measurements. These measurements were carried out on a regular basis during 1978-1985 between NASA'S Deep Space Network stations in California, Spain, and Australia. Analysis of 6800 pairs of delay and delay-rate observations made during 51 sessions produced estimates of 1300 parameters. The most significant of these are geophysical quantities and positions of extragalactic sources. The source catalog resulting from this analysis includes 106 sources fairly uniformly distributed over the celestial sphere, north of -45^deg^ declination. Almost all of the resulting source positions have formal uncertainties between 0.5 and 3 milliarcseconds (mas), with rms values of 2 mas in both angular coordinates. Internal consistency checks, as well as comparisons with independently determined source catalogs of comparable quality, indicate that relative source coordinates determined by VLBI contain systematic errors at the level of 1 to 2 mas.
Retrieve 127 NED objects in this reference.
Please click here for ADS abstract

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