The determination of the center of gravity of a planet from photographic plates

Details The determination of the center of gravity of a planet from photographic plates The determination of the center of gravity of a planet from photographic plates

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cemec..26..199a&link_type=abstract

(Conference on Analytical Methods and Ephemerides: Theory and Observations of the Moon and Planets, Namur, Belgium, July 28-31,

Astronomy and Astrophysics

Astronomy

1

Astronomical Photography, Center Of Gravity, Planetology, Solar System, Astronomical Coordinates, Jupiter (Planet), Microdensitometers, Photographic Plates, Saturn (Planet), Planets, Techniques, Procedure, Gravitational Properties, Photographs, Data, Jupiter, Saturn, Microdensitometer, Analysis

Scientific paper

Problems involved in the determination of the center of gravity of a planet from photographic plates are addressed. The fact that a planet usually has a large apparent diameter makes it difficult to determine the center of gravity. On a photographic plate, the size of the image of a planet depends on the exposure time and, mainly, on the focal length. In addition, the phase angle (sun-planet-earth) makes the image of the planet disymmetric and surface features make its brightness nonuniform. Tests for determining the center of gravity using different methods have been made for a planet whose satellite positions are well known (Jupiter is an example). These methods require a microdensitometric analysis of the plates and a better accuracy for the position of the center of gravity of the planet (referred to near stars) than classical methods using manual measuring machines.

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