Nutation modeling and VLBI observations (Souchay+, 1996)

Details Nutation modeling and VLBI observations (Souchay+, 1996) Nutation modeling and VLBI observations (Souchay+, 1996)

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ycat..41160473s&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/116/473. Originally published in: 1996A&AS..116..473S

Astronomy and Astrophysics

Astronomy

Vlbi, Earth

Scientific paper

Using geodetic and astrometric VLBI acquired between 1984-1994, we have determined coefficients in the nutation series with uncertainties of 10microarcseconds. This level of accuracy is quite sufficient to differentiate between alternate theories of nutation. We show that small terms predicted using the Kinoshita & Souchay (1990) rigid Earth theory of nutation revised by Souchay & Kinoshita (1996), agree well with the VLBI results at periods where the non rigid Earth corrections are reliable. These terms are different or absent from the Kinoshita (1977) theory that is the basis for the standard IAU 1980 model. We propose a nutation series based on the Kinoshita & Souchay theory using the Wahr (1979) transformation for a non rigid Earth that can be useful where the physical interpretation of the smaller terms is important. This series, called VKSNRE95.1, includes corrections to the nine largest terms derived from VLBI observations. (2 data files).

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