The southern Galactic halo star CS 22892‐052 is extremely metal‐poor, but has very large enhancements of all elements formed by neutron capture nucleosynthesis. In this paper, we discuss a high resolution spectroscopic analysis of this star, showing that r‐process neutron capture syntheses may account fully for the relative abundances of elements Ba through Er, and that probably a combination of the r‐process and the weak‐component s‐process may match the abundances of the lighter elements Sr‐Y‐Zr. ©1995 American Institute of Physics.