The first thing you should do before going against any SB is check its antimatter...if it has an antimatter capacity above 0, then you know it has special abilities...if its an Orky, odds are that ability is the deflection shield, which at lvl 2 is a huge defensive boost...
If that Orky is using deflection shield, I'd say its pretty much a requirement that you bring in a radiance with detonate antimatter or a dunov with EMP....
As TEC, ogrovs are the best thing to take down an SB...if that thing is close to fully upgraded, I wouldn't go with anything less than 20 ogrovs unless you are supporting them with a lot of firepower (LRMs, Bombers, and/or Kodiaks)...whatever you pick, repair bays need to be your first target...if you are using bombers, those hangars (if they're vasari) should be your second target...if you are shooting at the Orky while repair bays are in action and Phasic trap has disabled all your bombers, you are wasting your time...
In most cases I'd say 15 ogrovs, 5 cielos, 5 hoskikos, and 15 carriers could do it if there is no support...that is 445 fleet supply (if I did the math right)...anything less than that is likely going to not be fast enough, and honestly I'd go with more carriers and hoskikos if you can, that proposed fleet is going to take a long time and will suffer heavy losses...if the enemy fleet is there, you are going to lose no matter what unless you severely outnumber them...if they have a small contingent of units, cobalts and LRMs are your best bet...its likely that the Orky is supported by sentinels, support ships, or transports (which cobalts are the best against) and cobalts and LRMs are fast enough to get in and get out...if that Orky is supported by much more, well then you are just out of luck...hope you can rebuild your whole fleet faster than they can rebuild a starbase...
