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Stability of the Extragalactic Reference Frame Realized by VLBI

Published online by Cambridge University Press:  12 April 2016

C. Ma  and
D.B. Shaffer
C. Ma
Affiliation:
Geodynamics Branch Goddard Space Flight Center Greenbelt, MD 20771USA
D.B. Shaffer
Affiliation:
Geodynamics Branch Goddard Space Flight Center Greenbelt, MD 20771USA

Abstract

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The 318 compact extragalactic radio sources with positions derived from dual frequency Mark III VLBI data acquired by the geodetic and astrometric programs of NASA, NOAA, NRL and USNO form a celestial reference frame with stability in orientation and relative position at the 1 mas level. This paper examines the reference frame realized using 461,000 observations from 1021 observing sessions between 1979 August and 1990 August in the NASA Crustal Dynamics Project VLBI data base. Catalogs of positions estimated from subsets of data (annual, seasonal, network) show differences in orientation typically less than 1 mas provided precession and nutation are adjusted using a reference day. For 17 sources with >5 year time span and >200 one-day position estimates, the rates of change of right ascension and declination are generally less than 5 mas/century, giving upper limits on real motion.

Type
Part 1. Oral Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 135 - 144
Copyright
Copyright © United States Naval Observatory 1991

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