منابع مشابه
Gravity field and interior structure of Rhea
Doppler data generated with the Cassini spacecraft’s radio carrier waves at Xand Ka-bands can be used to determine the quadrupole moments of Rhea’s gravitational field. The resulting tri-axial field should be consistent with the assumption that Rhea is in tidal and rotational equilibrium. If so, we can construct interior models that are consistent with Rhea’s mean density of 1236 kg/m3, determi...
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The small and active Saturnian moon Enceladus is one of the primary targets of the Cassini mission. We determined the quadrupole gravity field of Enceladus and its hemispherical asymmetry using Doppler data from three spacecraft flybys. Our results indicate the presence of a negative mass anomaly in the south-polar region, largely compensated by a positive subsurface anomaly compatible with the...
متن کاملRhea gravity field and interior modeling from Cassini data analysis
During its tour of the Saturn system, Cassini performed two close flybys of Rhea dedicated to gravity investigations, the first in November 2005 and the second in March 2013. This paper presents an estimation of Rhea’s fully unconstrained quadrupole gravity field obtained from a joint multi-arc analysis of the two Cassini flybys. Our best estimates of the main gravity quadrupole unnormalized co...
متن کاملGravity field of the Orientale basin from the Gravity Recovery and Interior Laboratory Mission.
The Orientale basin is the youngest and best-preserved major impact structure on the Moon. We used the Gravity Recovery and Interior Laboratory (GRAIL) spacecraft to investigate the gravitational field of Orientale at 3- to 5-kilometer (km) horizontal resolution. A volume of at least (3.4 ± 0.2) × 106 km3 of crustal material was removed and redistributed during basin formation. There is no pres...
متن کاملGravity field of the Moon from the Gravity Recovery and Interior Laboratory (GRAIL) mission.
Spacecraft-to-spacecraft tracking observations from the Gravity Recovery and Interior Laboratory (GRAIL) have been used to construct a gravitational field of the Moon to spherical harmonic degree and order 420. The GRAIL field reveals features not previously resolved, including tectonic structures, volcanic landforms, basin rings, crater central peaks, and numerous simple craters. From degrees ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Planets
سال: 2001
ISSN: 0148-0227
DOI: 10.1029/2000je001367