0000000000226455

AUTHOR

J. A. López Ortí

showing 4 related works from this author

Improved Method for Orbital Elements Differential Correction.

1990

As was pointed out by IAU in 1976, an important problem in fundamental astronomy is the improvement of the vernal equinox and equator positions. To this aim, it is necessary to know the accurate values of minor planets orbital elements. The classical methods of orbital elements differential corrections are based on linking the observations at different epochs considering equal derivatives respect to the initial and osculating elements. In this paper we present an improved method in which the least squares matrix coefficients is calculated from the integration of the Lagrange planetary equations and its derivatives.

Orbital elementsPhysicsEquatorDifferential correctionAstronomyImproved methodEquinoxGeodesyPhysics::History of PhysicsastronomyAsteroidAstrophysics::Earth and Planetary AstrophysicsOrbital correctionDifferential (mathematics)Osculating circle
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Automated astrographic plates measuring process

1990

The astrographic plates measuring process applied at the Astronomical Observatory of Valencia has been described.

Physics::Fluid DynamicsPhysicsSpace and Planetary ScienceObservatoryAstrophysics::High Energy Astrophysical PhenomenaAstrophysics::Instrumentation and Methods for AstrophysicsProcess (computing)Computer Science::Programming LanguagesAstronomyAstronomy and AstrophysicsPhysics::History of PhysicsAstrophysics and Space Science
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Figures of equilibrium in close binary systems

1992

The equilibrium configurations of close binary systems are analyzed. The autogravitational, centrifugal and tidal potentials are expanded in Clairaut's coordinates. From the set of the total potential angular terms an integral equations system is derived. The reduction of them to ordinary differential equations and the determination of the boundary conditions allow a formulation of the problem in terms of a single variable.

Applied MathematicsMathematical analysisfigure of celestial bodiesspherical harmonicsBinary numberSpherical harmonicsAstronomy and AstrophysicsIntegral equationCelestial mechanicsComputational MathematicsClassical mechanicsSpace and Planetary ScienceModeling and SimulationOrdinary differential equationPoisson equationsclose binary starsBoundary value problemPoisson's equationReduction (mathematics)Mathematical PhysicsMathematicsCelestial Mechanics and Dynamical Astronomy
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Digital Image Processing in the Analysis of Astrometric Plates

1991

AbstractIn this paper, we display an improvement to our process of semi-automatic measuring of astrometric plates, in which the photometric sensor is substituted by a CCD system of image getting and digitalization. The advantages of this method are analyzed taking into account the possibilities of the image analysis in the space and frequency domain.

Image formationComputer sciencebusiness.industryBinary imageDigital imagingTop-hat transformImage processingDigital imageComputer graphics (images)Digital image processingComputer visionArtificial intelligencebusinessMicroscope image processingInternational Astronomical Union Colloquium
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