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Imaging photopolarimeter on Pioneer Saturn (1980)

Degewij, J. ; Blenman, C. ; Baker, L. R. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-17

Beschreibung: Results of Pioneer 11 imaging photopolarimeter observations of Saturn, its rings, and Titan are presented. The imaging photopolarimeter is a pointable telescope with an aperture of 2.5 cm and passbands of 390 to 500 to 720 nm which uses the spin of the spacecraft to scan across an object. Images of the Saturn system and of the rings are presented, and the absence of a D ring, structures in the C, B and A rings and the Cassini division and the discoveries of the F ring and the provisionally named Pioneer division separating it from the A ring are reported. A mean particle size less than 15 meters is estimated from estimates of total ring mass and the optical depth of the B ring. The discovery of the satellite 1979 S 1 at 2.53 Saturn radii is also noted. Models of the vertical aerosol structure of Saturn's atmosphere are compared with the polarization data, and it is indicated that the density of cloud particles decreases with altitude with a scale height about one fourth that of the gas, and that an optical depth of one is to be found at 750 mbar.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Science; 207; Jan. 25

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Spinel cataclasites in 15445 and 72435 - Petrology and criteria for equilibrium (1980)

Baker, M. B. ; Herzberg, C. T.

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: The problem of establishing the existence of equilibrium among the coexisting phases in the rock is addressed by presenting petrographic and mineral chemistry data on a new spinel cataclasite from 15445 (clast H) and data more extensive than those previously available on two clasts in 72435. Criteria useful in reconstructing the original petrology of these and other spinel cataclasites are analyzed by considering equilibrium among the different phases, that is, the mono- or polymict nature of these cataclasized samples. Finally, the role of impact processes in disturbing the equilibria is discussed.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX

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The cordierite- to spinel-cataclasite transition - Structure of the lunar crust (1980)

Herzberg, C. T. ; Baker, M. B.

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: A two-layer lunar crust model is proposed in light of geochemical relationships between spinel cataclasites and anorthosites, discussing the relative abundances of these rocks. The uppermost stratigraphic unit of this model consists of members of the anorthositic series, and is estimated to be 12-20 km thick. The lower, Mg-rich unit consists of rocks with cotectic mineralogical proportions, and may constitute the greatest volume of the crust.

Schlagwort(e): LUNAR AND PLANETARY EXPLORATION

Materialart: Conference on the Lunar Highlands Crust; Nov 14, 1979 - Nov 16, 1979; Houston, TX

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