0000000000328792

AUTHOR

A. Ortiz Gil

showing 3 related works from this author

Orbit determination and errors of a star catalogue

1995

Abstract We obtain Ceres orbit taking into account all perturbations and applying correction of phase effect to observations. More than 3000 observations have been used and the results agree with other determinations. We have also investigated the influence of systematic errors of a star catalogue on the observations and its effect on final elements. To that aim, a simulation procedure has been applied to Ceres observations, including different laws for errors of star catalogue versus spherical coordinates. The best relations have been applied to real observations of Ceres, in order to obtain elements and star catalogue corrections. Preliminary results of these calculations are presented.

PhysicsSystematic errorSpherical coordinate systemAstronomyA* search algorithmAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsStar cataloguelaw.inventionSpace and Planetary SciencelawOrbit (dynamics)Astrophysics::Earth and Planetary AstrophysicsOrbit determinationAstrophysics::Galaxy AstrophysicsPlanetary and Space Science
researchProduct

Star Image Identification and Characterization on Astrographic Plates

1994

The automatic identification and characterization of star images has great value for the preliminary analysis and measurement of astrographic plates. Our group at Valencia Observatory is using a small 2-D stage and a CCD camera under computer control to perform systematic measurements of bright asteroid plates. We are also applying this method to the processing of astrographic plates with crowded stellar fields and non-stellar objects in collaboration with the Pulkovo Observatory.

Ccd cameraAstrophysics::Instrumentation and Methods for AstrophysicsAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsStar (graph theory)Preliminary analysisComputer controlObservatoryAsteroidImage identificationAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsGeology
researchProduct

HST observation of the inner coma of 2060 chiron

1995

Abstract The analysis of persistent comae of very large and distant comets allows us to infer the poorly known physical properties of dust and icy grains produced beyond Jupiter. Chiron is particularly interesting because Fulle ( Astron. Astrophys. 282 , 980–988; 1994) has shown that the strong asymmetricity of its coma (West, Astron. Astrophys. 241 , 635–645 1991) allows us to infer rotational properties of Chiron's nucleus. In this paper we report the observation of the asymmetric inner coma of Chiron from the analysis of 44 images of Chiron and eight images of a standard star available from the HST archive. The images were taken during February/March 1993, when Ch iron was 9.3 AU from th…

PhysicsAstronJupiterSpace and Planetary ScienceOrientation (computer vision)IsophoteAstronomyAstronomy and AstrophysicsComa (optics)AstrophysicsLarge distanceImage restorationPlanetary and Space Science
researchProduct