Astronomy and Astrophysics – Astronomy
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sciam.234..108c&link_type=abstract
Scientific American, vol. 234, May 1976, p. 108-116.
Astronomy and Astrophysics
Astronomy
Europa, Io, Jupiter (Planet), Natural Satellites, Satellite Observation, Astronomical Photometry, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Planetary Structure, Surface Properties, Television Transmission
Scientific paper
The four largest of Jupiter's moons were first observed by Galileo in 1610. The current state of knowledge concerning the surfaces of the Galilean satellites is discussed. From photometry alone it can be concluded that the four objects have different surface compositions. In 1971 infrared instruments had become sensitive enough to make it possible to obtain higher-resolution spectra of all four satellites. The satellites appear also to have a variety of internal structures. New data obtained from Pioneer 10 and Pioneer 11 have improved the values concerning the satellite masses which were obtained some decades ago. New information, including several hundred high-resolution television pictures, is expected to be obtained in connection with missions involving a pair of Mariner spacecraft scheduled to be launched in 1977.
Cruikshank Dale P.
Morrison Douglas
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