We present high-resolution observations (R similar or equal to 10(5))
of the interstellar Na I D lines in the spectra of 23 stars which are
close to HD 50896 on the plane of the sky, plus HD 50896 itself. The r
esults are parameterized by using simple cloud models. We confirm that
HD 50896 lies beyond the cluster Cr 121 (which is in the same line of
sight), and estimate D similar or equal to 1.8 kpc.