Dark-ray and dark-floor craters on Ganymede, and the provenance of large impactors in the Jovian system

Details Dark-ray and dark-floor craters on Ganymede, and the provenance of large impactors in the Jovian system Dark-ray and dark-floor craters on Ganymede, and the provenance of large impactors in the Jovian system

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...89..318s&link_type=abstract

Icarus (ISSN 0019-1035), vol. 89, Feb. 1991, p. 318-346.

Computer Science

19

Albedo, Cratering, Ganymede, Jupiter Satellites, Meteorite Collisions, Planetary Craters, Satellite Surfaces, Satellite Imagery, Topography, Voyager 2 Spacecraft, Jupiter, Satellites, Ganymede, Craters, Surface, Features, Icy Bodies, Impacts, Features, Contamination, Crater Rays, Brightness, Evolution, Sputtering, Sublimation, Magnetic Effects, Thermal Effects, Albedo, Ice, Regolith, Gardening, Spacecraft Observations, Spectra, Color, Asteroids, Comets, Comparisons, Voyager Missions, Morphology, Diagrams, C

Scientific paper

The dark-floor and dark-ray craters on the icy Jovian satellite, Ganymede, may derive their visual characteristics from impactor contamination. It is presently hypothesized that the rays darken as a result of the near-surface concentration of impactor material; this could occur, first, due to magnetic sputtering while the rays are bright, and subsequently, once a critical albedo is reached, due to thermal sublimation into discrete icy and nonicy patches. Voyager visible spectra of dark rays indicate that most large-ray systems are 'redder' than grooved or cratered terrains, and are among the 'reddest' units on Ganymede. More than half of the recent impactors on Ganymede may have been reddish D-type asteroids or comets, accounting for the albedos and colors of dark terrains on both Ganymede and Callisto.

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