NAME

xy2rd -- Translate a 2-D image pixel coordinate to right ascension and declination.

USAGE

xy2rd infile[group] x y

DESCRIPTION

This task uses the group parameters CRVAL, CRPIX, and the CD matrix coefficients to translate a pixel coordinate to RA and DEC. Thus the epoch of RA and Dec is the same as these group parameters.

PARAMETERS

infile [string]

Input image name. Images are calculated one at a time and wildcards are not supported. If no group number is specified, it assumes the default group of 1.

x [real]

X pixel coordinate.

y [real]

Y pixel coordinate.

(hms) = yes [boolean]

Print the output RA in hour-minute-second and DEC in degree-minute-second?

If hms=no, output will be in decimal degrees.

(ra) [string]

The output right ascension.

(dec) [string]

The output declination.

EXAMPLES

1. Calculate RA and DEC of a pixel in the first group:

  wf> xy2rd w1234567t.d0h 19 53 

  wf> xy2rd w1234567t.d0h[2] 12.34 56.78 h-

BUGS

SEE ALSO

rd2xy