 Klinglesmith also published a period of in November 2015 and January 2017 ().Two more lightcurves by Robert Stephens at the Center for Solar System Studies gave a period of and hours with a brightness variation of and magnitude in March 2014 and September 2019, respectively ().According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), "Newcombia" measures () and () kilometers in diameter and its surface has an albedo of () and (), respectively.