SIMBAD references

New photometric (uvbyβ) observations of ZZ Mic are described. Reddening values and were derived from the photometry. Intrinsic and values indicate a mean effective temperature of and a mean surface gravity of. Theoretical evolutionary tracks yielded a mass of and an age of 0.56 Gyr. However, the pulsation mass was determined as. ZZ Mic in most respects resembles a typical Population I dwarf Cepheid. We collected 34 times of maximum light from the literature and our observation in order to investigate the variations of the values, and we confirmed a sign that the period is increasing.