title: Radar detection of phobos.
abstract: Radar echoes from the martian satellite Phobos provide information about that object's surface properties at scales near the 3.5-cm observing wavelength. Phobos appears less rough than the moon at centimeter-to-decimeter scales. The uppermost few decimeters of the satellite's regolith have a mean bulk density within 20% of 2.0 g cm(-3). The radar signature of Phobos (albedo, polarization ratio, and echo spectral shape) differs from signatures measured for small, Earth-approaching objects, but resembles those of large (>/=100-km), C-class, mainbelt asteroids.
authors.forename: S J
authors.initials: SJ
authors.lastname: Ostro
authors.forename: R F
authors.initials: RF
authors.lastname: Jurgens
authors.forename: D K
authors.initials: DK
authors.lastname: Yeomans
authors.forename: E M
authors.initials: EM
authors.lastname: Standish
authors.forename: W
authors.initials: W
authors.lastname: Greiner