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Long-Term Nutation and the Length Day Variation from VLBI Observations

Published online by Cambridge University Press:  12 April 2016

E.I. Yagudina  and
I.S. Sudnik
E.I. Yagudina
Affiliation:
Institute of Applied Astronomy, the USSR Academy of Sciences (IAA) 197022 Zdanov atr.8, LeningradUSSR
I.S. Sudnik
Affiliation:
Institute of Theoretical Astronomu, the USSR Academy of Sciences (ITA) 191187 Kutuzov quay LeningradUSSR

Abstract

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The shift of the celestial pole with respect to its 1980 position in longitude (Δψ) and obliquity (Δε) from the available VLBI measurement of 1984 year within IRIS project is estimated. Formal uncertainties of the angles Δψ and Δε are 5.9 mas and 2.7 mas respectively. The day length variation was obtained from the same data. Then attempt was made to obtain annual and semiannual nutation amplitudes. The values are in reasonable agreement with the determinations of other workers.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 381 - 384
Copyright
Copyright © United States Naval Observatory 1991

References

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