[daip] [!12019]: AIPS - AIPS clcorprm(8,9) reference time

[Jackie Villadsen]

Jackie Villadsen updated #12019
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AIPS clcorprm(8,9) reference time
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           Ticket ID: 12019
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12019
                Name: Jackie Villadsen
       Email address: jrv at astro.caltech.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 09 May 2018 12:25 AM
             Updated: 09 May 2018 12:25 AM
           Reply due: 11 May 2018 12:25 AM (2d 0h 0m)
      Resolution due: 02 February 2021 12:00 AM (999d 23h 35m)

Hi,I am doing astrometry with the VLBA on a nearby, high-proper-motion star.  Thanks so much for including the CLCOR option to track the drift of a source in mas/hr!  (That's clcorprm(8,9).)  I am interested in connecting the position of the star in VLBI to optical data.  When CLCOR removes the drift from the data, what time does it use as a reference?  i.e., which time during the observation does not have a phase center shift applied to it - the start of any scan in the observation, or the start of the first scan in the selected data (a certain field), or something else?  For reference, at the bottom I'm including an example of the clcor command I'm using.  Thanks so much for your help!Jackie Villadsen------------------------------------
default clcor
getn 1
opcode 'antp'
sour 'uvceti'
clcorprm 0 0 0 0 0 0 0, 0.4115, -0.0347
go
# clcorprm(8): RA drift in mas/hr
# clcorprm(9): dec drift in mas/hr


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