* Hera is the queen of the gods and the wife of Zeus. She is an Olympian goddess and resides on Mount Olympus.
* Apollo is the god of the sun, music, poetry, healing, and prophecy. He is also an Olympian god and lives on Mount Olympus.
Tartarus is the deepest part of the Underworld, reserved for the punishment of the most wicked souls. It's not a place where gods reside.
While Hera and Apollo have been involved in conflicts and had their share of anger and vengeance, they are not considered wicked enough to be sent to Tartarus.