Up: ASTRO language internal help
[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:
Source (S) relative to Observatory
Source (S) relative to Local Standard of Rest. This is the LSR ve-
locity furnished by the observer as part of the source coordinates.
Local Standard of Rest relative to Solar System Barycenter (G)
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
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