(2638) Gadolin 1939 SG 27 noviembre, 2017 aaznar Asteroid Photometric Survey, Mars-Crossing Asteroids Lightcurves Number: 2638 Designation: 1939 SG Name: Gadolin First Date: 2017/11/22 Points: 130 P1: 6.476 P1 error: 0.002 Max. Ampl.: 0.21