Earth rotation based on the celestial coordinates of the celestial intermediate pole

Capitaine, N.; Folgueira, Marta; Souchay, J.

doi:10.1051/0004-6361:20053778

Cited by 9 publications

(8 citation statements)

References 15 publications

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“…Then the precession corrections used in the P04 model given in Capitaine et al (2005) are compatible with the updated non-linear terms of −960 µas cy −1 in longitude and +340 µas cy −1 in obliquity, which read…”

Section: Integration Constantsmentioning

confidence: 99%

“…Another way of dealing with d 2 ψ 1 and d 2 ω 1 was suggested in the P04 paper (Capitaine et al 2005), by which a new set of integration constants can be generated. The test of this problem with VLBI data is performed in Sect.…”

Section: Integration Constantsmentioning

confidence: 99%

“…should be eliminated from (r 0 ) MHB and (u 0 ) MHB . However, the way to apply the effect of d 2 ψ 1 and d 2 ω 1 is controversial: the IAU 2006 (P03, Capitaine et al 2003a) and later P04 model (Capitaine et al 2005) applied these corrections with opposite signs. This caused a discrepancy of hundreds to one thousand microarcseconds per century in precession rates.…”

Section: Comparison Of the Precession Expressions With Vlbi Celestialmentioning

confidence: 99%

“…This test can be presented as being an extension of the test of the P04 versus P03 solutions in Capitaine et al (2005), with ten additional years of VLBI data. We note that the only difference between the LC and LC solution is that different integration constants (P03-like and P04-like) have been used.…”

Section: Comparison Of the Precession Expressions With Vlbi Celestialmentioning

confidence: 99%

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Evaluation of a possible upgrade of the IAU 2006 precession

Liu

Capitaine

2017

A&A

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Context. The International Astronomical Union (IAU) adopted a new precession model at its 2006 General Assembly. After more than ten years since the publication of the so-called IAU 2006 precession, we have noticed progress in solar system ephemerides and geophysical observations, which can be used to refine the precession model. Another progress is the increase by 30% since 2003, of the length of the very long baseline interferometry (VLBI) observations to be compared with the theoretical model. Results. For the precession of the ecliptic, the changes in the new solutions with respect to the IAU 2006 are about several tens of microarcseconds in the linear terms of P A and Q A . The upgraded precession of the equator is such that the quadratic and cubic terms in the quantity ψ A differ significantly from IAU 2006 due to the revised J 2 model. The statistics of the VLBI celestial pole offsets and least squares fits with different empirical models, show that the LC precession is slightly more consistent with the VLBI observations, but the improvement relative to the IAU 2006 model is not definitely convincing at present. Conclusions. The upgraded LC precession obtained with the latest theoretical and observational improvements has shown some advantages with respect to the IAU 2006 model. However, due to negligible changes in the precession of the ecliptic and large uncertainties in the J 2 variation, we recommend that the standard IAU 2006 model be retained for practical use and continuity reason. The next precession-nutation model should be constructed with a uniform dynamical approach in the framework of ICRF3 and Gaia reference frame and without the use of a conventional ecliptic.

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Section: Integration Constantsmentioning

confidence: 99%

Section: Integration Constantsmentioning

confidence: 99%

Section: Comparison Of the Precession Expressions With Vlbi Celestialmentioning

confidence: 99%

Section: Comparison Of the Precession Expressions With Vlbi Celestialmentioning

confidence: 99%

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Evaluation of a possible upgrade of the IAU 2006 precession

Liu

Capitaine

2017

A&A

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“…The equations as functions of the GCRS CIP coordinates, X, Y can be written with similar notations as (Capitaine et al 2005):…”

Section: Theoretical Basis For the Modelsmentioning

confidence: 99%

Models and nomenclature in Earth rotation

Capitaine

2009

Proc. IAU

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Abstract. The celestial Earth's orientation is required for many applications in fundamental astronomy and geodesy; it is currently determined with sub-milliarcsecond accuracy by astrogeodetic observations. Models for that orientation rely on solutions for the rotation of a rigid Earth model and on the geophysical representation of non-rigid Earth effects. Important IAU 2000/2006 resolutions on reference systems have been passed (and endorsed by the IUGG) that recommend a new paradigm and high accuracy models to be used in the transformation from terrestrial to celestial systems. This paper reviews the consequences of these resolutions on the adopted Earth orientation parameters, IAU precession-nutation models and associated nomenclature. It summarizes the fundamental aspects of the current IAU precession-nutation models and reports on the consideration of General Relativity (GR) in the solutions. This shows that the current definitions and nomenclature for Earth's rotation are compliant with GR and that the IAU precession-nutation is compliant with the IAU 2000 definition of the geocentric celestial reference system in the GR framework; however, the underlying Earth's rotation models basically are Newtonian.

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