posible RCB 2MASS J05201751+3916577 05 20 17.51 +39 16 57.7 OBJECT DATE MAG +/- N OBS CAT -------- ------------ --------- ----- -- --- --- J052017+39 20111125.041 12.21CV 0.01 6 DSS USN J052017+39 20111128.039 12.13CV 0.01 5 DSS USN J052017+39 20111222.034 11.91CV 0.01 5 DSS CMC J052017+39 20120103.934 11.93CV 0.01 7 DSS CMC J052017+39 20120114.850 11.94CV 0.01 5 DSS CMC J052017+39 20120117.855 11.90CV 0.00 2 RZD CMC J052017+39 20120117.947 11.94CV 0.01 6 DSS CMC J052017+39 20121223.804 11.99CV 1 CUU CMC J052017+39 20121230.778 11.95CV 1 CUU CMC J052017+39 20130103.856 11.97CV 0.02 2 RZD CMC J052017+39 20130104.815 11.87CV 1 CUU CMC J052017+39 20130111.791 11.91CV 1 CUU CMC J052017+39 20130121.766 11.91CV 1 CUU CMC DSS:Adolfo San Segundo RZD:Diego Rodríguez CUU:Judá Curto Amigo CAT: USNOA2/CMC14 -unfiltered and reduced using V mag