Technical description of solution iaad0001_dsnx 1. Purpose of solution: 24 hour session solution for combination techniques 2 - Analysis Center: Institute of Applied Astronomy Russian Academy of Science 3. Short narrative description of solution: All available dual-band Mark III/IV/V observations from 1984 on were analysed for this solution. The CRF is defined by ICRF-t.2 catalogue. The TRF is defined by no-net-translation and rotation constraints for the coordinates of all sites in a VLBI session related to VTRF2005. The values of the official list of VLBI antenna axis offsets issued by the IVS Analysis Coordinator (update 20050106) were used. 4. Estimated parameters: a. celestial frame: No b. terrestrial frame: X, Y, Z c. Earth orientation: CIP-X, CIP-Y, Xp, Yp, UT1-UTC, Xpdot, Ypdot, LOD d. zenith troposphere: linear trend+stochastic e. troposphere gradient: east and north offset f. station clocks: quadratic trend+stochastic g. other: No 5. Celestial reference frame: a. a priori source positions: ICRF-ext.2 b. definition of orientation: fixed source coordinates of the ICRF-ext.2 6 - Terrestrial reference frame: a. a priori station positions: VTRF2005 b. a priori station velocities: VTRF2005 c. reference epoch: 1997.0 d. station positions adjusted in solution: Yes e. definition of origin, orientation, and their time evolution: no-net-translation and no-net-rotation of position with respect to VTRF2005 for all stations of the VLBI session 7. Earth orientation: a. a priori precession-nutation model: IAU2000A b. Short-period tidal variations in x, y, UT1: IERS Convetions(2003) recomended model d. EOP estimation: CIP-X, CIP-Y, Xp, Yp, UT1-UTC, Xpdot, Ypdot, LOD each session for the middle epoch of it 8. A priori geophysical models: a. troposphere: hydrostatic component with VMF1 mapping function b. solid Earth tide: IERS Conventions(2003) c. ocean loading: IERS Conventions(2003) d. atmosphere loading: regression model 9. Data type: Group delays 10. Data editing: editing of outliers during adjustment when necessary. 11. Data weighting: Observations are weighted using std reported in observational files 12. Standard errors reported: Reported formal errors are derived from least-squares estimation propagated from data uncertainties and re-weighted to achieve the chi-square unity. 13 Software: QUASAR