Has anybody issues with this mission? I have tried it twice. After destroying the comet you get three shards. You have to destroy those and they give three splinters each. You have to destroy all nine splinters.
One shard disappears after getting destroyed. So you can only destroy 6 splinters and cannot complete the mission.
I am a sad panda. I love this mission and the Klingon disruptor pistol, the reward, is (imo) one of the best pistols.