VLBA Calibrators List : Help Page

Field Center RA, DEC :

     The center of the search field, RA and DEC, in J2000 coordinates.

     The entry format may be :

        RA =  6h45m10.76s   DEC = 16d41'57.82"
        RA = 06H45M         DEC = 16d42'
        RA = 06:45:10.76    DEC = 0.2914594  (radians)

     An '*' for RA or DEC will not restrict the search on that axis.

Search Radius :

     The default search radius is 10 degrees.
     The maximum search radius is 45.0 degrees. 

Sun or Planets :

     Selecting the Sun or a planet overrides the field center
     RA and DEC values.

Planet Observe Epoch :

     You must set a date/time (UTC) for the position for the Sun or planet.
     Current format : 2001NOV25 10:20:30.0 

Field Source Name :

    Enter a source name of any type (NGC1234, 3C123, W3OH, etc).
    The search tool will search through the VLBA Alias Table for
    your source, and if successful will take the J2000 RA and DEC
    for the field center from the IAU - J2000 name, J1234+5678.

Observing Frequency Band :

    Click in your observing frequency band. This is used to select the
    calibrator flux densities for that observing band. If no fluxes
    are found for your observing band, the fluxes from the closest 
    frequency band are displayed.

Antenna Array :

    When it becomes usable, the antenna array selection along with
    the frequency band selection will allow automatic rejection of 
    spatially resolved calibrator sources.

Minimum Calibrator Flux :

    Specify a minimum calibrator source flux density below which
    sources will be excluded (in Janskys).

Maximum Position Error :

    Specify a source position error bar that rejects calibrator
    sources having larger position errors (in milliarcseconds).

Select Calibrator Source List :

    This feature is under development.

Maximum Number of Sources Returned :

    Simply the number of sources accepted by the tool requirements
    that the user wishes to be displayed.

Debug Printout (temporary) :

    For testing purposes only.

Calibrator Source Sort Order :

    List the selected sources in ascending order sorted by
    Radial Distance, alphabetical Source Name, RA, Dec, or
    Flux Density.

Calibrator Source Output File :

    Not functioning.