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Cellinoid shape model for Hipparcos data

Ip, Wing-Huen; Cellino, Alberto; Hestroffer, Daniel +1 more

Being intermediate between a regular triaxial ellipsoid shape and a more complex convex shape, the so-called "cellinoid" shape model consists of eight octants of eight ellipsoids with the constraint that neighbouring octants share two common axes. The resulting variety of possible shapes, obtained at the cost of only three extra parameters to be a…

Titania's radius and an upper limit on its atmosphere from the September 8, 2001 stellar occultation

Sutherland, W.; Colas, F.; Lellouch, E. +150 more

On September 8, 2001 around 2 h UT, the largest uranian moon, Titania, occulted Hipparcos star 106829 (alias SAO 164538, a V=7.2, K0 III star). This was the first-ever observed occultation by this satellite, a rare event as Titania subtends only 0.11 arcsec on the sky. The star's unusual brightness allowed many observers, both amateurs or professi…