[daip] [!12656]: AIPS - Offset source moving in RA during observation

[Eric Greisen]

Eric Greisen updated #12656
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Offset source moving in RA during observation
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           Ticket ID: 12656
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12656
                Name: Andy Biggs
       Email address: abiggs at eso.org
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 07 September 2018 04:11 PM
             Updated: 07 September 2018 07:48 PM
           Reply due: 11 September 2018 05:45 PM (3d 21h 56m)
      Resolution due: 03 June 2021 12:00 AM (999d 4h 11m)

I would have used UVFIX on the full data set before any imagingjust to make sure that u,v,w were up to standards (which they mayalready be).  I am surprised that DO3DIM made no difference.The object is 2000 beam widths separated so our instinct is thatit should matter.  But you are at relatively high freq and it would dependon the details of the geometry.  A radial smearing could come fromexcessive time averaging but that would not move systematicallywhich is what you found.  I have Vivek curious about this so wemay get an answer but the UVFIX and DO3D is what occurred to himalso.  BTW he is working on Cygnus A which has a similar pair ofsources well separated - the core and the "new" source.Eric


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