Abstract
We classify the nontrivial deformations of the standard embedding of the Lie superalgebra K(2) of contact vector fields on the (1,2)-dimensional supercircle into the Lie superalgebra of superpseudodifferential operators on the supercircle. This approach leads to the deformations of the central charge induced on K(2) by the canonical central extension of & psi DO(S(1|2)) (C) 2009 Published by Elsevier B.V.