Technical description of solution mao2003o 1. Purpose of solution: session EOP 2. Analysis center: Main Astronomical Observatory, National Academy of Sci. of Ukraine (MAO NASU), Kiev 3. Short narrative description of solution: Almost all available VLBI sessions conducted since 2000 were processed. Data analysis was performed according to IERS Conventions 2003 (except atmospheric pressure loading model). Coordinates of stations were estimated as global parameters, EOP were estimated as local for each session(s) and clock function, wet zenith delay and its gradients was treated as stochastic ones modelled by random walk process. Square root information filter (SRIF) was used for data processing. 4. Estimated parameters: a. celestial frame: none b. terrestrial frame: X0, Y0, Z0 c. Earth orientation: x, y, UT1-TAI, X_CIP, Y_CIP d. zenith troposphere: stochastic with random walk model e. troposphere gradient: stochastic with random walk model f. station clocks: polynomials + stochastic with random walk model g. baseline clocks: none h. other: none 5. Celestial reference frame: a. a priori source positions: ICRF-Ext.1 b. source positions adjusted in solution: no 6 - Terrestrial reference frame: a. a priori station positions: ITRF2000 (except new stations) b. a priori station velocities: ITRF2000 velocity field, NNR-NUVEL-1A model was used if a station velocity from ITRF2000 solution is equal to zero c. reference epoch: 1997.0 d. station positions/velocities adjusted in solution: yes e. definition of origin, orientation, and their time evolution: Evolution of the TRF is set by no-net-translation and no-net-rotation, conditions on the horizontal position adjustments of the following stations: ONSALA60, WETTZELL, HARTRAO, ALGOPARK, KOKEE, WESTFORD, FORTLEZA and HOBART26 f. station parameter estimation: X0, Y0, Z0 h. stations with discontinuous positions and date of discontinuity: none i. stations with nonlinear velocities: none j. relativity scale: consistent with TT k. permanent tide correction: no l. solution identification or reference: mao2003o 7. Earth orientation: a. a priori precession model: IAU 2000A b. a priori nutation model: IAU 2000A c. a priori short-period tidal variations in x, y, UT1: - ocean tidal variations in x, y and UT1, Ray et. al., 1994 according to IERS Conventions 2003 notation; - atmospheric tidal variations in x, y and UT1, Brzezinski, Bizouard and Petrov, 2002; - non-tidal variations in oceanic angular momentum, de Viron et. al. d. EOP estimation: x, y, UT1, X_CIP, Y_CIP for each session(s) 8. A priori geophysical models: a. troposphere: MTT mapping function for hydrostatic and wet zenith delays if metheo parameters were good, NMFh2 and NMFw2 were used for stations with suspicious metheo parameters. b. solid Earth tide: IERS Conventions 2003 c. ocean loading: IERS Conventions 2003, based on GOT00.2 Ocean tide model d. atmosphere loading: none 9. Data type: delays 10. Data editing: outliers were removed from analysis 11. Data weighting: uncertainties of time and ionosphere delays were used for weights calculation 12. Standard errors reported: formal errors derived from SRIF estimation procedure 13 Software: SteelBreeze-2.0.2 14. Other information: For comments or questions contact S.Bolotin .