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Clarifications concerning the definition and determination of the celestial ephemeris poleThe precise meaning and consequences of the introduction beginning in 1984 of the 1980 IAU theory of nutation (Wahr, 1980; Seidelmann, 1982) based on the celestial ephemeris pole (CEP) rather than the instantaneous pole of rotation (IPR) of the previous theory (Woolard, 1953) are analyzed and discussed. The CEP implicitly accounts for the forced diurnal polar motion and thus implies a fixed change of 0.0087 arcsec in the mean celestial pole. It is pointed out that past determinations of the obliquity and the celestial pole which were assumed to be referred to the IPR were actually referred to the CEP. A number of clarified formulations of the new theory are proposed.
Document ID
19850057249
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Capitaine, N.
(Paris Observatoire; Bureau International de l'Heure, Paris, France)
Williams, J. G.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Seidelmann, P. K.
(U.S. Naval Observatory Washington, DC, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: Astronomy and Astrophysics
Volume: 146
Issue: 2, Ma
ISSN: 0004-6361
Subject Category
Astronomy
Accession Number
85A39400
Distribution Limits
Public
Copyright
Other

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