Multi-image photometric solutions for the Galilean satellites

Details Multi-image photometric solutions for the Galilean satellites Multi-image photometric solutions for the Galilean satellites

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pggp.rept..261m&link_type=abstract

In NASA. Washington Rept. of Planetary Geology Program, 1983 p 261-262 (SEE N84-23431 13-91)

Mathematics

Astronomical Photometry, Galilean Satellites, Image Processing, Limb Darkening, Digital Data, Functions (Mathematics), Illumination, Mosaics, Phase Shift, Spatial Distribution, View Effects, Voyager Project

Scientific paper

A method for determining the limb darkening planet, acquired in the same wavelength range (lambda), within a few degrees of the same phase angle (alpha), but acquired at different illumination and viewing conditions. The two images are first geometrically registered in simple cylindrical format. A limb darkening factor is computed for each pixel pair and output as a digital image. Systematic trends with photometric coordinates across this image indicate either a calibration error or inappropriateness of the particular photometric function. This method can be used for any photometric function with a single limb darkening factor, such as the Minnaert function or the function which combines the Lommel-Seeliger and Lambert functions. By solving for many pairs of images, the limb darkening factor as a function of alpha and lambda may be determined. The two image limb darkening solutions determined for 1 Voyager image pair on Ganymede, 16 image pairs on Callisto, 44 pairs on Europa, and 19 pairs on Io are discussed.

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