 Lightcurve analysis gave a consolidated rotation period of 8.665 hours with a brightness amplitude between 0.14 and 0.42 magnitude.According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Planckia" measures between 35.657 and 44.34 kilometers in diameter and its surface has an albedo between 0.1771 and 0.219.The "Collaborative Asteroid Lightcurve Link" derives an albedo of 0.1982 and a diameter of 39.35 kilometers based on an absolute magnitude of 9.4.