The US Navy has got this new railgun. They say it can launch a 23 lb missile up to speeds of mach 7. If you put these on Phobos and instead of shooting missiles; shoot pieces of Phobos, would you be able to get Phobos into a synchronous orbit? ( A synchronous orbit for Phobos would allow a space elevator between Phobos and Mars.) How much of Phobos would be left once it got to synchronous orbit?