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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…