TITANIA HIDES A BRIGHT STAR
On Friday night, September 7-8, 2001, the largest moon of Uranus, Titania, passed almost directly in front
of a 7.2-magnitude star (HIP 106829).
For observers in a wide path that sweeps from western Europe to the northern tip of South America,
the star disapeared for up to 76 seconds. Nothing quite like this has occurred since July 3, 1989,
when Saturn's largest moon, Titan, covered 28 Sagittarii in an even rarer occultation.
The occultation was visible in Venezuela, Colombia, Panama, Ecuador, and northernmost Peru,
where Uranus and its moons were high in a fully dark sky. Conditions were also
favorable in extreme southwestern Europe, where the event took place near 1:55 UT,
well before the start of Saturday morning twilight.
Click on image for full-sized view.
Preliminary results Location: Observatory Fernando Tonel, Portugal
37 Deg 08 min 28.7 sec N
8 Deg 37 min 33.2 sec W, Elevation: 64 m Observers: Fernando Tonel, Pedro Ré, Helmut Denzau Telescope: 10 inch SCT, f=2540 mm Detector: IOTA Occultation Camera, TC 245 Chip, 50X50 pixel window Sampling 0.22 s, Binning 3, 12 bit dynamic, no Filter Timing: DCF 77 Recording time: 1 h 30 min - 2 h 25 min UTC
Beginning of occultation: 1 h 54 m 45.2 s UTC
End of occultation: 1 h 55 m 27.7 s UTC
Duration of occultation: 42.5 s +- 0.13 s Fading of the star about 0.5 s Click on images for full-sized view.