SourceEpochImageVisibility
1144+402
1997JAN10 2 GHz , 8 GHz 2 GHz , 8 GHz
1999APR15 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2001MAY09 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2004FEB15 2 GHz , 8 GHz 2 GHz , 8 GHz
2010JUN23 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.