Thanks. What I wanted to do was pop in and destroy the WP defenders and then next turn if there is no Star Destroyer move on the rest of the planets. If there is one, retreat before he can do my fleet. Should work ok.
Note that if the enemy has a star destroyer sitting on the star, set to sentry and then blow up the star, then the star will blow up on the first move that ship has after your fleet arrives.
You could warp in on day 6, and have the sun blow up on day 10 for example, because the sunbuster is sentried.