Most of the time, aerobraking is a good thing. However Jupiter is the exception to the rule. Arthur C. Clarke was in error when he used aerobraking for Jupiter in "2010". Aerobraking is a two step process. First you come in from deep space and then skim through the upper atmosphere to bleed off kinetic energy. The reduction in kinetic energy puts you into a planet centered orbit with the periapsis in the planet's atmopshere. You then leave the atmosphere and follow the new orbit to apoapsis where you do a "periapsis raising burn". The delta-V from this burn raises your periapais out of the atmosphere. If you don't do this then your spacecraft willl burnup when it returns to periapsis after one orbit.

Now the problem with Jupiter is the delta-V required to raise the periapsis out of the atmosphere after aerocapture is greater than the delta-V for an ordinary Jupiter Orbit Injection burn at periapsis without aerocapture. This is nonintuitive and only true for a really big planet like Jupiter.

Gary