Finding Phase Calibrators

 

The following commands will plot the phase calibrators close to NGC 7027.

 CATALOG SAMPLE                        ! First define the catalog
 CATALOG GAG_ASTRO:PHASE /ALTERNATE    ! Phase Calibrators
 OBSERVATORY BURE                      ! The observatory
 TIME 03:00 01-JAN-1990                ! the time and date
 SOURCE NGC7027                        ! Get source position
 FRAME EQ RA|PI*12 DEC|PI*180 45       ! Frame Eq., centered on Source, 
				       ! 45 degrees in total size
 SOURCE NGC7027/DRAW                   ! Plot source position
 SOURCE /DRAW /ALTERNATE               ! Draw Phase calibrators
 HEADER                                ! label the plot.

The output will look like Figure 3.