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Implementation of the IAU 2000 definition of UT1 in astronomy

Published online by Cambridge University Press:  21 October 2010

Nicole Capitaine  and
Patrick T. Wallace
Nicole Capitaine
Affiliation:
SYRTE, Observatoire de Paris, CNRS, UPMC, 61, Av. l'Observatoire, 75014, Paris, France email: nicole.capitaine@obspm.fr
Patrick T. Wallace
Affiliation:
Space Science & Technology Dept., STFC/RAL, Didcot, Oxon, OX11 0QX, UK email: patrick.wallace@stfc.ac.uk
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Abstract

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We recall the concepts and nomenclature associated with the IAU 2000 definition of UT1 as function of the Earth rotation angle (ERA). We comment on the complications that arise when UT1 is regarded as both an angle and a time scale. We review the IAU 2006 expressions for the position of the celestial intermediate origin (CIO) and the equation of the origins, and the associated CIO and equinox based procedures for the celestial-to-terrestrial transformation.

Keywords

astrometryreference systemstimeEarth
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 212
Copyright
Copyright © International Astronomical Union 2010

References

Capitaine, N., Wallace, P. T., & Chapront, J. 2003a, A&A 412, 567–586Google Scholar
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Capitaine, N. & Wallace, P. T. 2006, A&A 450, 855–872Google Scholar
IERS Conventions update, 2009, http://tai.bipm.org/iers/convupdt/convupdt_c5.htmlGoogle Scholar
Wallace, P. T. & Capitaine, N. 2006, A&A 459, 981–985Google Scholar