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The celestial reference frame defined by VLBIVLBI currently produces the most accurate positions of celestial objects. From 1979 to 1987, 114 extragalactic radio sources have been observed with dual-frequency Mark III VLBI as part of the NASA Crustal Dynamics Project and the NGS POLARIS/IRIS program. The formal statistical errors of conventional celestial coordinates are as small as 0.3 milliarcseconds. The fundamental quantity measured by VLBI is the arc length between radio sources. Thus, it is suggested that VLBI be used to establish a coordinate reference frame based solely on radio positions, and that this system not necessarily be coupled to right ascension and declination.
Document ID
19890026381
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ma, C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Shaffer, D. B.
(Interferometrics, Inc. Vienna, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Astronomy
Meeting Information
Meeting: IAU Symposium on the Impace of VLBI on Astrophysics and Geophysics
Location: Cambridge, MA
Country: United States
Start Date: May 10, 1987
End Date: May 15, 1987
Accession Number
89A13752
Distribution Limits
Public
Copyright
Other

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