SourceEpochImageVisibility
2319+272
1995APR12 2 GHz , 8 GHz 2 GHz , 8 GHz
1998AUG10 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2006JUL11 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2006SEP13 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.