Results 141 to 150 of about 265 (182)

Galilean satellite obliquities

Journal of Geophysical Research: Planets, 2000
The obliquities, or angular separations between spin pole and orbit pole, for the Galilean satellites of Jupiter are all small but nonzero. We present calculations of the expected obliquity values based on the well known orbital parameters and recent estimates of the moments of inertia of the satellites, under the assumption that all are in Cassini ...
Bruce G. Bills, Richard D. Ray
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Galilean Satellites: Identification of Water Frost

Science, 1972
Water frost absorptions have been detected in the infrared reflectivities of Jupiter's Galilean satellites JII (Europa) and JIII (Ganymede). We have determined the percentage of frost-covered surface area to be 50 to 100 percent for JII, 20 to 65 percent for JIII, and possibly 5 to 25 percent for JIV (Callisto).
C B, Pilcher, S T, Ridgway, T B, McCord
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Touring the Galilean satellites

Astrodynamics Conference, 1970
Galilean satellites touring by Jupiter spacecraft, discussing orbit calculation and encounter ...
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Formation of the galilean satellites in a gaseous nebula

Icarus, 1982
A model for Galilean satellite formation was analyzed in which the satellites accrete in the presence of a dense, gaseous disk-shaped nebula and rapidly form optically thick, gravitationally bound primordial atmospheres. Upper-bound temperatures expected during accretion lead to partially differentiated structures for both Ganymede and Callisto ...
Lunine, Jonathan I., Stevenson, David J.
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Masses of the Galilean Satellites of Jupiter

Science, 1976
Numerical data derived from the observation of the four great satellites of Jupiter are compared with the values obtained through Sampson's theory by using the new JPL (Jet Propulsion Laboratory) system of masses. It is not possible to fit the coefficient of the free oscillation in the longitude of Ganymede, whose argument is l
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Eclipse spectrophotometry of the Galilean satellites

Icarus, 1979
Narrowband spectrophotometry of satellite eclipses is presented for each of the Galilean satellites. Comparing the partially eclipsed full-phase satellite disk to the uneclipsed disk can reveal colorimetric inhomogeneities on the surface. The trailing half-disk of Ganymede is slightly blue compared to the leading half-disk.
Dale W. Smith, Paul E. Johnson
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Thermal properties of the Galilean satellites

Icarus, 1973
Radiometry in the 20-micron band of eclipses of each of the four Galilean satellites of Jupiter provides information about the thermal properties of the uppermost surface layers of these bodies. Their thermal inertias are all smaller than those of the moon or of Mercury; there is no evidence for atmospheres, and where the data are of high quality ...
David Morrison, Dale P. Cruikshank
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Surficial textures of the Galilean satellites

Nature, 1988
The observations of the Galilean satellites of Jupiter obtained with the IUE have been analyzed as a function of solar phase angle. By fitting the measurements to a shadowing model, comparative descriptions of the microtextures of the optically active portion of the surfaces of the satellites are derived.
Bonnie J. Buratti, Robert M. Nelson, Arthur L. Lane   +2 more
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Icy craters on the Galilean satellites?

Icarus, 1978
The high degree of echo depolarization observed for linearly polarized incident waves in the case of radar observations of Europa, Ganymede, and Callisto is consistent with a rough, icy surface. Measurements with circularly polarized waves, however, conducted in 1976 suggest that the types of surface irregularities found on the Galilean satellites must
Steven J. Ostro, Gordon H. Pettengill
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Atlas of the Galilean Satellites

2010
Complete color global maps and high-resolution mosaics of Jupiter's four large moons – Io, Europa, Ganymede and Callisto – are compiled for the first time in this important atlas. The satellites are revealed as four visually striking and geologically diverse planetary bodies: Io's volcanic lavas and plumes and towering mountains; Europa's fissured ice ...
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