Original: On September 8, 2001, Titania occulted a bright star (HIP106829) with a visible magnitude of 7.2; this was an opportunity to both refine the moon's diameter and ephemeris, and to detect any extant atmosphere.
Simplified: Occultation On September 8, 2001, Titania occulted a faint star; this was a chance to both refine its diameter and ephemeris, and to detect any extant atmosphere.