[12] In January 2008, rotational lightcurves of Gavrilin were obtained from photometric observations by the BINAST group including David Higgins at the Hunters Hill Observatory (E14) in Australia and Petr Pravec at the Ondřejov Observatory in the Czech Republic.
Lightcurve analysis gave a rotation period of 49.12 hours with a brightness amplitude of 0.25 magnitude (U=3/3).
[9][a][b] The photometric observation also revealed that Gavrilin is a synchronous binary asteroid with a minor-planet moon in its orbit.
The satellite measures approximately 2.41 kilometers in diameter (a secondary-to-primary diameter-ratio of at least 0.32) and has an orbital period identical to that of the primary's rotation, 49.12 hours.
[8] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 5.74 kilometers based on an absolute magnitude of 13.61, while the Johnston's Archive estimates a diameter of 7.54 kilometers for the primary.