 In October 2005, a rotational lightcurve of "Sekiguchi" was obtained from photometric observations by French amateur astronomers René Roy and Laurent Bernasconi.Lightcurve analysis gave a well-defined rotation period of hours with a brightness variation of 0.72 magnitude ().In October 2010 and November 2011, two more lightcurves were obtained at the Palomar Transient Factory, rendering a period of 5.4048 and 5.4100 hours with an amplitude of 0.58 and 0.27 magnitude, respectively ().