Erk, that's really bad luck to have jumped there when the planet was at its closest to the jump point.
PDCs have way more missiles than ships, in my experience, but usually can be less of a hassle because, once you got rid of the ships, they're relatively easy to catch unaware with a fighters' first strike. But since we basically jumped on top of all of them, that's a lot of missiles heading towards our fleet. Let's hope some defenses and ships aren't missile-launchers.
Unless I'm sorely mistaken on how the game works, it makes even more sense to flee exactly in the opposite direction to incoming missiles - their relative speed will be that lower than if we stood still, and targetting systems are way better, the lower the enemy speed is, so this increase the odds for our own anti-missile systems.