SourceEpochImageVisibility
1800+440
1997JAN11 2 GHz , 8 GHz 2 GHz , 8 GHz
2003JUL09 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2008MAY14 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2010JUN23 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.