 The discovery was announced in October 2008.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.According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), "Gavrilin" measures 4.91 and 5.49 kilometers in diameter and its surface has an albedo of 0.27 and 0.28, respectively.