An investigation of the improvement of photographic plate position measurements for the Galilean satellites of Jupiter using photometric image processing

Details An investigation of the improvement of photographic plate position measurements for the Galilean satellites of Jupiter using photometric image processing An investigation of the improvement of photographic plate position measurements for the Galilean satellites of Jupiter using photometric image processing

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....86...55a&link_type=abstract

Astronomy and Astrophysics, vol. 86, no. 1-2, June 1980, p. 55-63. In French.

Astronomy and Astrophysics

Astrophysics

3

Astrometry, Astronomical Photography, Astronomical Photometry, Galilean Satellites, Image Processing, Photographic Plates, Computer Programs, Jupiter (Planet), Microdensitometers, Precision, Jupiter, Satellites, Position (Location), Photometry, Analysis, Image Processing, Microdensitometer, Techniques, Diagrams, Data, Coordinates, Distance, Procedure

Scientific paper

The improvements in precision to be obtained by the use of an automatic image processing system to determine the positions of Jupiter and its Galilean satellites are evaluated. A computer-guided microdensitometer was used to measure photometric intensities and positions on a long-focus astrometric photographic plate containing images of the Galilean satellites, Jupiter, field stars and a trail left by a star or satellite for the determination of orientation. The problem of determining the center of gravity of the planet is approached by the determination of planetary limb according to inflection points on either side of the photometric density profile. Automatic measures of Jupiter position made on the basis of this procedure are found to represent a significant improvement in accuracy relative to manual measurements, allowing an improvement in planet-satellite distance determinations. It is noted that the use of an interactive computer facility of large capacity would allow a reduction in processing time associated with a means of screening plate quality.

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