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Towards a Future ICRF RealizationThe data and analysis for the ICRF were completed in 1995 to define a frame to which the Hipparcos optical catalog could be fixed. Additional observations on most of the 608 sources in the overall ICRF catalog have been acquired using a small portion of geodetic observing time as well as astrometric sessions concentrating on the southern hemisphere. Positions of new sources have been determined, including approx.1200 from a VLBA phase calibrator survey. A future ICRF realization will require improved geophysical modeling, sophisticated treatment of position variations and/or source structure, optimized data selection and weighting, and reidentification of defining sources. The motivation for the next realization could be significant improvement in accuracy and density or preparation for optical extragalactic catalogs with microarcsecond precision.
Document ID
20020050381
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Ma, Chopo (NASA Goddard Space Flight Center Greenbelt, MD United States)
Gordon, D. (NASA Goddard Space Flight Center Greenbelt, MD United States)
MacMillan, D. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Petrov, L. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Smith, David E.
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Astrophysics
Meeting Information
Meeting: Second IVS General Meeting
Location: Tsukuba
Country: Japan
Start Date: February 4, 2002
End Date: February 7, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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