This goddess convinced on
This goddess convinced one of her lovers to attempt to seduce his wife while in disguise; after he became convinced of his wife's infidelity, she whisked him off to Syria.  After finding out about this goddess's affair with Ares, Aphrodite cursed this daughter of Hyperion and Theia to remain perpetually in love, and among her other lovers were Astraeus and Orion.  She requested to Zeus that another of her lovers be made immortal but, since she forgot to ask also for eternal youth, he grew older and older until he eventually withered into a cricket. For 10 points, name this lover of Tithonus, a goddess who opens the gates of heaven every day so that her brother Helios can ride his chariot across the sky.
This goddess convinced one of her lovers to attempt to seduce his wife while in disguise; after he became convinced of his wife's infidelity, she whisked him off to Syria.  
{Eos} (prompt on {Dawn})