mascons


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mascons

(mas -konz) Short for mass concentrations. Positive gravitational anomalies associated with the young circular lunar maria, where relatively dense disk-shaped masses are now known to be located close to the surface: because the gravitational attraction is somewhat higher over these regions, mascons perturb the orbits of lunar satellites. They were produced either by the mare basalt itself as it flooded the basins or by the uplifting of higher-density mantle material during basin excavation. Mascons imply the existence of a rigid lunar crust for at least 3000 million years. The removal of crust during crater formation may also produce negative gravitational anomalies; these are observed in the younger large craters and around the Orientale Basin, which is only partly lava-filled. Because the circular maria are topographic lows, mascons may be partially isostatically compensated, i.e. they may have sunk under their excess density until some sort of equilibrium depth was reached with relation to adjacent material.
References in periodicals archive ?
"Five conspicuous mascons, each about 50 to 200 kilometers in extent and perhaps 50 kilometers below the surface, were detected under ...
'Does each of these mascons represent an asteroidal-sized body which caused its associated mare by impact?"'
Based on the LO data, the spherical harmonics of the Moon (degree 4 in the tesserals and degree 8 in the zonals) were first published in 1968 [16]; later that year, the existence of large mascons under the lunar ringed maria was also discovered [2].
GRAIL scientists found the mascons by combining the gravity data from
By eradicating the line between fact and fiction, particular drugs called Mascons have eroded any possibilities for sustaining the environment as well as for supporting the natural and creative mind.
The Aestuum mascon is more pronounced than Vaporum's, perhaps indicating a thicker lava filling.
"Mascons are local concentrations of mass beneath lunar basins, causing gravity anomalies.
Thanks to Lunar Prospector's gravity data, mission scientists have also discovered several new mass concentrations, or mascons, beneath the lunar surface - four of them on the far side.
Localized concentrations of mass ("mascons") coincided with a number of near-side basins.
This view is buttressed by the fact that Lamont lies atop a mascon, a subsurface mass concentration.
Gravitational data from the Lunar Prospector spacecraft shows that Humboldtianum harbors a mass concentration (mascon)--a localized gravitational anomaly that tugs on orbiting spacecraft.
But when the Lunar Orbiter spacecraft circled the Moon, Lamont's position was found to correspond to a moderate-size mascon, a gravitational anomaly arising from a concentration of mass that perturbs spacecraft orbits.