Not sure you need tracking for this: if you let the camera still, you should obtain a stripe that will vary in luminosity as the planet passes, which basically

Not sure you need tracking for this: if you let the camera still, you should obtain a stripe that will vary in luminosity as the planet passes, which basically integrates the sampling point for you. (This of course is limited to short period planets, and stars with sufficient luminosity to actually produce a stripe)...