Continuous and dynamically consistent orbits have been computed using satellite laser ranging (SLR) data to Starlette for a one-year period during 1976 and 1977 and the three-year period from 1983 through 1985. A low degree and order ocean tide solution, consisting of a total of 66 tidal parameters from 14 tidal constituents, was obtained in a combined solution using both the one-and three-year Starlette orbits. An enhanced model of the Schwiderski [1980] tide solution was used both as the a priori and the background tide model. The model contains 368 tidal coefficients from 21 tidal constituents. Yearly values for the second-degree annual tides, St, which produce seasonal variations on the Starlette node, were obtained also. These variations were found to have year-to-year fluctuations of more than 25% about the mean value and produced significant long-period perturbations in the Starlette orbit. The Starlette tide solution is in good agreement with the Schwiderski tide solutions and with other satellite solutions, including multi-satellite tide solutions. The average uncertainties are approximately 0.1 cm for the estimated semidiurnal and diurnal tides and 0.4 cm for the long-period tides. The discrepancies of effective k•. inferred from the Starlette tide solution and other tide solutions are less than 0.01. The tide solutions were evaluated using orbit fits of a three-year LAGEOS and a one-year Starlette long are. The results indicate that the Starlette tide solution produces significantly improved orbit fits for both LAGEOS and Starlette. The uncertainties for the estimated tide model coefficients were used to predict tidal errors for the LAGEOS orbit and were found to be consistent with the apparent tidal errors present in this orbit. The computed secular change in the Moon's mean motion due to tidal dissipation is-24.8+0.8 are second/century 2, which is in good agreement with the results obtained from other investigations. INTRODUCr•oN the ascending node and one cycle of the dominant K• ocean tide Advances in the precision of satellite laser ranging (SLR) perturbation is about 91 days. observations to near-Earth geodetic satellites have contributed The largest source of error limiting the accuracy of the Starlette significantly to the fields of geodetic and geodynarrdc research. orbit is ntismodeling of the Earth's gravity field. A Starlette-Two geodetic satellites, LAGEOS and Starlette, have been tailored gravity field model, PGS-1331, was developed using excellent tools for such studies. In particular, precise Starlette data collected from 1975 through 1978 in combination determinations for Earth rotation parameters, baseline motions, with the GEM-9 normal equations by Marsh et al. [1985]. The and station coordinates defining the conventional terrestrial range residuals for five-day Starlette orbits were at the 60-70-cm system have been obtained from SLR measurements to the level using this gravity field. Since then, improved Earth gravity LAGEOS satellite. The LAGEOS-derived Earth rotation field models...
S U M M A R YThe secular change in the mean motion of the Moon, ri, caused by the tidal dissipation in the ocean and solid Earth is due primarily to the effect of the diurnal and semidiurnal tides. The long-period ocean tides produce an increase in ti, but the effects are only 1 per cent of the diurnal and semidiurnal ocean tides. In this investigation, expressions for these effects are obtained by developing the tidal potential in the ecliptic reference system. The computation of the amplitude of equilibrium tide and the phase corrections is also discussed. The averaged tidal deceleration of the Moon's mean motion, ri, from the most recent satellite ocean tide solutions is -25.25 f 0.4 arcseconds/century'. The value for ri inferred from the satellite-determined ocean tide solution is in good agreement with the value obtained from the analysis of 20 years of lunar laser ranging observations.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.