With a decent shield (Mine is 2500 f/b protection) you can joust the beast multiple times, taking out one component each time. Tactic: Although it is bristling with weapons, it seems that none of them are very accurate. If one is destroyed, another will hyper into the system so that the Empire may maintain a constant presence. There is always an Imperial Star Destroyer in Deep Space. Once the bridge is annihilated, the starship will break up and explode in a brilliant shower of sparks and wrecked machinery.(And now you collect your measly 900 Combat xp, as well as 10k Starship xp, but it also gives about 18,000 credits)

Bridge (in the center of the upright 'T', below the shield towers).

Reactor (on the upper hull, on the right side facing the starship).

Secondary Shield (the conning tower to the right, facing the starship).

Shield (the spherical conning tower to the left, facing the starship).

The cannon may be targeted and destroyed however, in order to disable and finally bring down one of these massive starships, the following components must be targeted and destroyed in this order: Be wary that the bridge itself accommodates a large proportion of the laser cannons, making a full frontal assault very difficult.

They are also frequently escorted by Imperial TIE Fighters, though the escort is often out of range of a frontal assault on a Destroyer and may be bypassed. Each Star Destroyer is sometimes equipped with 100 laser cannons, but the one in Ord Mantell and some in Deep Space has 99 guns, situated around its hull with a range exceeding 1200m, and thus may fire upon adversaries no matter their attack vector. Rebel pilots may attack and destroy these behemoths, though they do not go down easily. Imperial-class Star Destroyers are extremely powerful Imperial NPC starships found in the Deep Space zone of the galaxy, and Ord Mantell. An Imperial Star Destroyer patrolling Deep Space Game Info

Endurance class star destroyer