Determination of the corrections to the celestial pole coordinates using LLR observations

Details Determination of the corrections to the celestial pole coordinates using LLR observations Determination of the corrections to the celestial pole coordinates using LLR observations

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..153z&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Lunar Laser Ranging (LLR), which is one of the most accurate astrometric technique, has many applications in various domains including astronomy, gedoynamics and gravitational physics. It consists in determining the round-trip travel times of light pulses between stations on the Earth and reflectors on the surface of the Moon.
Analysis of LLR observations allows us to determine many parameters of the Earth-Moon system, such as station coordinates on the Earth, coordinates of the retro-reflectors on the lunar surface, lunar gravity field parameters,... Here, we focus on the determination of the Earth Orientation Parameters (EOP) especially, the direction towards the Celestial Intermediate Pole (CIP) in the Geocentric Celestial Reference System.
We have first calculated the LLR residuals over a period of more than 37 years, using IAU 2000A-2006 as a model of precession nutation (i.e MHB 2000 nutation of Mathews et al. 2002 and P03 precession of Capitaine et al. 2003) and the CIO based procedure. Second, we have determined the corrections to the the IAU 2000A-2006 X and Y coordinates every 70 days. The results obtained give an interesting estimation of the celestial pole coordinates, even if the accuracy is not at the same order as from VLBI because of the insufficient density of the observations.

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