Stability of ICRF, a Time Series Approach

Details Stability of ICRF, a Time Series Approach Stability of ICRF, a Time Series Approach

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ivsg.conf..280f&link_type=abstract

International VLBI Service for Geodesy and Astrometry: 2000 General Meeting Proceedings, p. 280

Astronomy and Astrophysics

Astronomy

1

Inertial Reference Systems, Statistical Analysis, Time Series Analysis, Celestial Reference Systems, Atmospheric Correction, Time Lag, Radio Sources (Astronomy)

Scientific paper

The qualification and the maintenance of the International Celestial Reference Frame (ICRF) source directions are currently based on global statistics on the complete data set of observations. As the founding hypothesis in the selection of extragalactic objects for accessing a quasi-inertial reference system is that their directions are fixed in space, the time variability of some of the sources is only used as a rejection criterion. We show that a significant proportion of the sources have apparent motions with non-random noise spectrum. We suggest that time series statistics be introduced in the computation of ICRF in order to take into account the error spectrum of the source motions. Test computations using different statistical approaches are performed. Their results are compared with those of the classical method.

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