27
Phobos
& Deimos: Two
“misplaced” asteroids?
•Phobos and Diemos are small (~25 km and ~15 km diam.)
moons of Mars
•Look like captured asteroids rather than moons formed
in place
•Are “C” class – i.e. dark
“Carbonaceous” type “asteroids”
Grooves seem related to the large crater called “Stickney”