Get Coordinates by Cursor

 

A fast way to determine equatorial, ecliptic or galactic coordinates from a displayed image is to use the coordinate cursor. Coordinates   can be determined for any equinox. The command syntax is

GET/COORDINATES [system] [equinox]

 

• system is the coordinate system and can be either equ[atorial], ecl[iptic] or gal[actic], the default is equ[atorial].
• equinox is the equinox in decimal centuries, the default is 2000.0.

The result is written to the display overlay, to the terminal screen and to the keywords COODEG/D/1/2 and COOSTR/C/1/70. Example:

GET/COORDINATES equ 1950.0

The result is displayed to the terminal screen

  Result :
  Equatorial coordinates (Epoch 1950.00 ) :
  -------------------------------------------
  right ascension (h:m:s)   :  05H40M38.5S
  right ascension (degrees) :   85.160322
  declination (d:m:s)       :  -69D21M07S
  declination (degrees)     :  -69.351971
  -------------------------------------------

and is written to the keywords COODEG and COOSTR

COODEG(1)     = 85.1603216
COODEG(2)     = -69.3519709
COOSTR(1:11)  = 05H40M38.5S
COOSTR(15:24) = -69D21M07S

Other examples are:

GET/COORDINATES equ 1990.0
GET/COORDINATES ecl 2000.0
GET/COORDINATES gal

Note:Be aware, that the positions can only have the accuracy of one image pixel, which is 15 arcsec in case of the image testdata1:image.bdf.