Only time I've had this happen is when I've been stuck in combat, usually with someone who's glitched through the world or into a crate or something. Just pick a direction and drive for a while, and it should reset, at which point you can go back and kill it, or just keep going til you leave combat. You cannot leave H-047C normally by clicking on the Tempest as you can on other planets due to the nature of H-047C's environment limiting you to the Nomad. Therefore, you need to actually use the hotkey (T for default on PC) which doesn't require you to actually travel to the Tempest first. Also, there are 2 Forward Stations near the Tempest on H-047C that you should be able to travel to if for some reason you feel compelled to simulate an actual departure by being near the ship when you use the hotkey. The Tempest is not always a quick-travel point, too. Quick-travel points have the >> symbol on them to indicate such. An absence of such marks, as on Aya and similar, means the intended destination is not a QT point and you need to select a different target.
