Analysis of information sources in references of the Wikipedia article "Phobos (bulan)" in Malay language version.
When the error bars are taken into account, only one of these, Phobos, has a porosity below 0.2...
It is light, with a density less than twice that of water, and orbits just 5,989 kilometer (3,721 bt) above the Martian surface.
One of the most striking features of Phobos, aside from its irregular shape, is its giant crater Stickney. Because Phobos is only 28 kali 20 kilometer (17 kali 12 bt), it must have been nearly shattered from the force of the impact that caused the giant crater. Grooves that extend across the surface from Stickney appear to be surface fractures caused by the impact.
When the error bars are taken into account, only one of these, Phobos, has a porosity below 0.2...