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The asymmetry parameter [beta] of the photoelectron angular distribution in photoionization of the molecule HI was measured using a tunable coherent VUV source. The target was cooled to a rotational temperature of less than 20 K by a supersonic beam expansion. The data show pronounced resonance structure which is compared to results on a target at nearly room temperature and to an ab-initio calculation by H. Lefebvre-Brion and coworkers.