«Close Inspection for Phobos». «It is light, with a density less than twice that of water, and orbits just 5 989 kilometer (5 989 000 m) above the Martian surface.»
Murchie, S. L.; Erard, S.; Langevin, Y.; Britt, D. T.; m.fl. (1991). «Disk-resolved Spectral Reflectance Properties of Phobos from 0.3–3.2 microns: Preliminary Integrated Results from PhobosH 2». Abstracts of the Lunar and Planetary Science Conference. 22: 943. Bibcode:1991pggp.rept..249M.
«Stickney Crater-Phobos». «One of the most striking features of Phobos, aside from its irregular shape, is its giant crater Stickney. Because Phobos is only 28 ganger 20 kilometer (28 000 ganger 20 000 m), 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.»
usgs.gov
planetarynames.wr.usgs.gov
«Stickney». planetarynames.wr.usgs.gov. 29. november 2006.