Can't remember for sure, but I think the aim of this mission is to survive for a bit, destroy the first Nomad battleship, survive a bit longer then go back to the base.

If the first battleship appears after a set time, not after a certain number of Nomad interceptors have been destroyed, you could just try running away from the interceptors Dodge and stay alive, then attack the battleship form the opposite side to the interceptors. Keep well away from it and use torpedoes. Take your time, let your shields regenerate.

and be carefull of the second battleship that de-cloaks before u are recalled to toledo

Make sure you have a heavy, Order, or advanced thruster mounted. Get used to tapping it and jinking whenever you aren't shooting something...and once you've gotten that down, work on doing so even when you are shooting. If you can possibly get away and let your shields come back on their own, do so to save on shield batteries. Staying on the move is the single best defense against enemy fire; don't rely on shields or armor alone to save you.

Stalker missiles are quite effective at taking out Nomads due to their high maneuverability and the Nomads' lack of shields. I'm not sure if the launchers are available on any Order bases, but if they are consider carrying one to help thin out the herd(but be aware that the ammo is limited).

Mines can also be useful; try laying 5 or so in a big swarm, most if not all of them will hit something.

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Proud owner and operator of a Patriot!
Proud owner and operator of a Stiletto!
Proud ally of the Bounty Hunters' Guild!
Proud hater of Nomad weapons!
Proud user of all things underestimated!
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For the last time...there is no "N" in "TURRET"!

I've never tried this, but I don't think there's a time limit. You could just go round to the other side of the planet and wait, and when you need to destroy the battleship, go there in a wide circle, avoiding the Nomad ships. Worth a try

no, then u fail mission because they say u gotta get back into the battle. read.

read some of the excellent faqs/ walkthrough at gamespot.com

in fact, juni keeps harping on you to get moving if you stay away from the battleship and near the planet.

anyway, thanks for the tips guys. utimately i got into a groove of killing a few nomad interceptors than firing missles (catapault) and torpedos than closed in for a few shots with my lasers. after that, more interceptors appeared and i went back to killing a few. it worked out pretty good because after killinga few interceptors that'd almost always drop either a few batteries or nanobots.
after the battleship was destroyed it was smooth sailing from then on.... well until i got to dock with the osiris and saved my game.