SourceEpochImageVisibility
2143-156
1997JAN10 2 GHz , 8 GHz 2 GHz , 8 GHz
2000JAN31 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2005AUG26 8 GHz 8 GHz
2006JUL11 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
2010JUN23 2 GHz+ , 8 GHz+ 2 GHz+ , 8 GHz+
A "+" after the frequency indicates VLBA+ observations.