Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-11-29
Astronomy and Astrophysics
Astrophysics
1 page (LaTeX), IAU Symp.166, The radio catalog is available at ftp://maia.usno.navy.mil/rorf , and complete poster paper is a
Scientific paper
The radio observations are based on dual frequency Mark--III VLBI data from 1979 until the end of 1993. Currently 436 sources define the celestial inertial frame. A comparison to the JPL94R01 catalog is made. Position vs. time plots of selected sources show significant apparent non linear proper motions. The status of the project and recent results from optical observations are presented.
Fey Alan Lee
Johnston Ken J.
Russell James L.
Zacharias Norbert
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