SourceEpochImageVisibility
1928+738
1997JAN10 2 GHz , 8 GHz 2 GHz , 8 GHz
1998APR15 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
1998JUN24 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2006SEP13 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.