LOL, are you still being serious? I can’t tell …

Err… obviously not… Hydrogen is a relatively light element… an object the size we are talking about (ie not even moon sized let alone the size of a planet) would not have the gravity required to keep the matter from being blown away from a detonation let alone maintain a chain reaction required to actually keep it burning. Even Jupiter doesn’t have enough Hydrogen stored under enough pressure and heat to start a chain reaction when hit by the Shoemaker Levy comet. The heat generated by the impact would have been enormous but still not sufficient to start a fusion reaction.