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RECENT IMPROVEMENTS OF LUNAR LASER RANGING TECHNIC AND DATA REDUCTION

RECENT IMPROVEMENTS OF LUNAR LASER RANGING TECHNIC AND DATA REDUCTION. Technical Improvements. New Apollo Station (Apache Point/ New Mexico): * LLR normal points since 2006 * Detection of Lunokhod 1 (22/04/2010) ‏ Meo Station (Caussols / France):

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RECENT IMPROVEMENTS OF LUNAR LASER RANGING TECHNIC AND DATA REDUCTION

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  1. RECENT IMPROVEMENTS OF LUNAR LASER RANGING TECHNIC AND DATA REDUCTION Technical Improvements • New Apollo Station (Apache Point/ New Mexico): • * LLR normal points since 2006 • * Detection of Lunokhod 1 (22/04/2010)‏ • Meo Station (Caussols / France): • * Modernization of Gasse Station (2005-2009)‏ • * LLR normal points with the new configuration since end of 2009 • * Adaptative Optics in development (to improve the laser convergence in the atmosphere ) Reduction Improvements • Combinaison of LLR and VLBI Determination of DX & DY corrections to the • celestial pole coordinates(Zerhouni et Capitaine, 2009) • Simulatneous Adjustement of Numerical Integration of Planets and Moon (INPOP)‏ • with help of LLR data

  2. LINKS BETWEEN ICRS AND DYNAMICAL SYSTEM USING LUNAR LASER RANGING

  3. Authors Ф (arsecond)‏ ε (arsecond)‏ Ψ (arcsecond)‏ LLR Chapront -0.05542 ± 0.00011 84381.41091 ± 0.00009 0.04451 ± 0.00019 LLR Zerhouni -0.05538 ± 0.00009 84381.41081 ± 0.00009 0.04196 ± 0.00015 Solutions Δε (arcsecond)‏ Ψsinε (arcsecond)‏ LLR Chapront -0.0072 -0.0177 LLR Zerhouni -0.0070 -0.0167 VLBI -0.0068 -0.0167 LINKS BETWEEN ICRS AND DYNAMICAL SYSTEM USING LUNAR LASER RANGING

  4. Position angles of the dynamical reference system at J2000.0 w.r.t. the ICRS e D: equator to ecliptic rotation angles Φ and ε LLR(1969-2006): f= -14.5 mas ; e = 84381.404’’ B: frame bias matrix between the celestial equatorial system at J2000 and the ICRS [CRS ] = D(B)PNSW [TRS] E ERA matrix CIO based IAU2006/2000A PN matrix IERS C04 polar motion matrix LLR(1969-2006): h0 = -7.0 mas ; x0 = -16.7 mas VLBI(MHB2000): h0 = -6.8 mas ;x0 = -16.6 mas from W. Zerhouni’sPhD thesis

  5. CORRECTIONS TO THE CELESTIAL POLE COORDINATES LLR (1987-2006) (lunar ephemeris ELP2000) Combination of LLR and VLBI (1995-2006) from Zerhouni & Capitaine, A&A 2009 (507, 3, 1687-1695); W. Zerhouni’sPhD thesis

  6. INFLUENCE OF STATION POSITION IN ITRF ON LLR RESIDUALS

  7. INFLUENCE OF STATION POSITION IN ITRF ON LLR RESIDUALS

  8. A NEW SELENODESIC REFERENCE POINT LUNOKHOD 1 IS BACK IN LLR Lunokhod 1 (lost in 1971) Lunokhod 2 LRO image (March 2010)‏ The excentric position of Lunokhod 1 will allow a better decorrelation between Lunar Libration & Lunar orbit First laser echos on Lunokhod1 (by Tom Murphy 22 April 2010)‏

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