Phobos and Deimos, moons of Mars

Phobos and Deimos, moons of Mars

Fig. 8.30a . A high-resolution camera on the Mars Reconnaissance Orbiter provided these close-up images of the Martian moons Phobos (above) and Deimos (Figure 8.30b). The illuminated part of Phobos is about 21 kilometers across. The large crater Stickney, at the lower right, has a diameter of about 9 kilometers, nearly half the size of Phobos. This crater is named after Angeline Stickney (1830-1892), wife of Asaph Hall (1829-1907) who discovered the two small satellites of Mars. (Courtesy of NASA/JPL-Caltech/U. Arizona.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University