[1] Roberts is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.

[3] In March 2008, a rotational lightcurve of Roberts was obtained from photometric observations at the Oakley Southern Sky Observatory in Australia.

Lightcurve analysis gave a well-defined rotation period of 3.278 hours with a high brightness amplitude of 0.58 magnitude (U=3), indicative of an elongated shape.

[8] In 2016, a modeled lightcurves using photometric data from various sources, gave a sidereal period of 3.27835±0.00005 hours and two spin axes of (63.0°, 49.0°) and (231.0°, 49.0°) in ecliptic coordinates (λ, β).

[5][6][7] CALL assumes an albedo of 0.10 – a compromise value between the stony (0.20) and carbonaceous (0.057) asteroids of the inner and outer main belt, respectively – and calculates a diameter of 16.73 kilometers based on an absolute magnitude of 12.0.