  We study a moduli problem on a nodal curve of arithmetic genus 1, whose
solution is an open subscheme in the zastava space for projective line. This
moduli space is equipped with a natural Poisson structure, and we compute it in
a natural coordinate system. We compare this Poisson structure with the
trigonometric Poisson structure on the transversal slices in an affine flag
variety. We conjecture that certain generalized minors give rise to a cluster
structure on the trigonometric zastava.
