[8][9] In February 2013, a rotational lightcurve of Suruga was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (714) in Colorado.
Lightcurve analysis gave a well-defined rotation period of 3.4069 hours with a brightness variation of 0.14 magnitude (U=3), which indicates a nearly spheroidal shape.
[8] According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Suruga measures 6.471 kilometers in diameter and its surface has an albedo of 0.320,[6][7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.13 kilometers with an absolute magnitude of 13.1.
[3] During Brian Warner's photometric observations in 2013, it was revealed, that Suruga is a synchronous binary system with a minor-planet moon in orbit.
Based on the brightness variations of the mutual eclipsing/occultation events, Warner estimates that the satellite's mean-diameter is at least 21% of that of Suruga's (Ds/Dp of >0.21±0.02).