Sometimes it just does NOT appear when I lock in a destination. Sometimes if I switch a CV/SV seat it appears, but I have been trying and no luck. I'm stuck, no way to prgoress when I can't warp.
If it's an adjacent system (planet/sector in the same solar system), you can still warp there, *IF* you can see it on the backdrop. For example, if you want to warp to the moons at the adjacent gas giant, you can see it on the backdrop. Point your ship at it and you should still be able to warp to it. Edit: This doesn't fix the problem you reported; it's just something as work-around so you can continue to play.
Unfortunately, the mission takes me to an asteroid filed in the system (the planetary fragment mission) and I cannot see it