SourceEpochImageVisibility
1216+487
1997JAN11 2 GHz , 8 GHz 2 GHz , 8 GHz
1999AUG02 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2002JAN16 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2007JAN24 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.