1670 Minnaert (1934 RZ) is a main-belt asteroid discovered on September 9 1934 by H. van Gent at Johannesburg (LS).Photometric observations of this asteroid collected during 2004–2005 show a rotation period of 3.528 ± 0.001 hours with a brightness variation of 0.23 ± 0.02 magnitude.
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