next up previous contents
Next: TIME Up: ASTRO language internal help Previous: SET   Contents


        [ASTRO\]SOURCE  [name  [...]] [/DRAW [argument]] [/ALTERNATE] [/SUN]
    [/FLUX Fmin Fmax]

    Compute the coordinates of a source from the current catalog (or the al-
    ternate catalog, if the option /ALTERNATE is used). If no name is speci-
    fied, all sources of the catalog are selected.  Source  coordinates  may
    also  be  directly  specified in the command line, in the same format as
    the catalog file. The /DRAW option is used to draw the  source  name  on
    the plot at its current position (Azimuth, Elevation).

    The  source  coordinates  (azimuth and elevation at time of computation)
    are printed on the screen, as well as the  line-of-sight  components  of
    the following velocities:
      - V(S/OBS)
        Source (S) relative to Observatory
      - V(S/LSR)
        Source  (S)  relative to Local Standard of Rest. This is the LSR ve-
        locity furnished by the observer as part of the source  coordinates.
      - V(LSR/G)
        Local Standard of Rest relative to Solar System Barycenter (G)
      - V(G/OBS)
        Solar System Barycenter (G) relative to the Observatory
    All velocities are in km/s, positive if the distance is increasing. With
    the above convention, V(S/OBS) = V(S/LSR)+V(LSR/G)+V(G/OBS). Coordinates
    and velocities are written in SIC variables, in the ASTRO%SOURCE% struc-
    ture (just type EXAMINE ASTRO%SOURCE% to get the complete list).

    The output of the SOURCE command can be modified with the following  op-
    tions:  SOURCE  /SUN  will  also  list  the sun avoidance limits; SOURCE
    /PRINT suppresses the printing of Azimuth, Elevation, and the velocities
    and prints the source properties as in catalog; SOURCE /QUIET suppresses
    all printout (useful to avoid too many messages on the screen in e.g.  a
    loop on many sources).

    SOURCE  /FLUX  Fmin Fmax will select only sources with flux densities in
    the specified range. Marker sizes will be proportional to the (logarithm
    of  the) flux. This is useful to, e.g., filter a list of potential cali-

    Arguments to SOURCE /DRAW may be LINE, MARKER, SYMBOL, or FULL,  as  for
    command PLANET:
      LINE   will draw a line from the previously computed position
             (SOURCE or PLANET)
      MARKER will draw a marker (GreG style defined by GREG\SET MARKER)
             at the computed position
      SYMBOL will draw the source name in capitals at the computed position
      FULL   will combine MARKER and SYMBOL (the name will be offset
             one marker size above the computed position).
    Default  is  SYMBOL. If several arguments are given they will be used in

Gildas manager 2014-07-01