[member="Face"]
We have a fair number of Sith available to us, and plenty of ships: Kaine's fleet, Abyss' fleet (if it's not at Malachor), Ignus' fleet. You'll need to bring a lot of weapons and resources: we've just gone Major, after all! I should also note that we have our own Mandalorian allies that might drop by to deal with rogue Mando forces.
That said, we're still in the process of consolidation: there are no orbital weapons platforms or stations you'll have to take out, and many of the planet's defenses were neutralised when we arrived, and are thus under repair or reconstruction. Thus, the majority of defenses will be our Sith forces: ships, troopers, the Sith themselves.
Just want to clarify the nature of this one: is it a Skirmish without political repercussion, or something more?
EDIT: Okay, now we know who Tekkadan are...what the heck? You can't possibly think to attack a planet in Ascendancy control with ONE writer. What's going on there?