An Introduction to Modern Astrophysics · Problem 19.10

The Planetary System — Carroll & Ostlie

Physics — Astrophysics · roche-limit-mars-phobos

Problem

Using the data in Appendix C, estimate the Roche limit for the Mars--Phobos system. Phobos's mean density is

2000

kg m

^{-3}

and it orbits at a distance of

9.4 \times 10^6

m. Explain the suggestion that Mars may develop a small ring system in the future.