 In October 2004, a rotational lightcurve of "Newcombia" was obtained from photometric observations by American amateur astronomer Walter R. Cooney Jr. in collaboration with John Gross, Dirk Terrell, Vishnu Reddy and Ron Dyvig.Lightcurve analysis gave a well-defined rotation period of hours with a brightness variation of magnitude ().An identical period of hours with an amplitude of magnitude was determined in April 2014, by Daniel Klinglesmith and colleagues at the Etscorn Observatory in New Mexico ().