Author/Authors :
Busch، نويسنده , , Michael W. and Ostro، نويسنده , , Steven J. and Benner، نويسنده , , Lance A.M. and Giorgini، نويسنده , , Jon D. and Magri، نويسنده , , Christopher and Howell، نويسنده , , Ellen S. and Nolan، نويسنده , , Michael C. and Hine، نويسنده , , Alice A. and Campbell، نويسنده , , Donald B. and Shapiro، نويسنده , , Irwin I. and Chandler، نويسنده , , John F.، نويسنده ,
Abstract :
In November 2005, we observed the moons of Mars using the Arecibo 2380-MHz (13-cm) radar, obtaining a result for the OC radar albedo of Phobos ( 0.056 ± 0.014 ) consistent with its previously reported radar albedo and implying an upper bound on its near-surface bulk density of 1.6 ± 0.3 g cm −3 . We detected Deimos by radar for the first time, finding its OC radar albedo to be 0.021 ± 0.006 , implying an upper bound on its near-surface density of 1.1 ± 0.3 g cm −3 , consistent with a high-porosity regolith. We briefly discuss reasons for these low radar albedos, Deimosʹ being possibly the lowest of any Solar System body yet observed by radar.
