NAME

rd2xy -- Translate right ascension and declination to a 2-D image pixel coordinate.

USAGE

rd2xy infile[group] ra dec

DESCRIPTION

This task uses the group parameters CRVAL, CRPIX, and the CD matrix coefficients to translate RA/Dec to the pixel coordinate. Thus the epoch of RA and Dec must be 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.

ra [real]

The right ascension.

dec [real]

The declination.

(hour) = yes [boolean]

Is the input RA in hours or degrees?

(x) [real]

The output X pixel coordinate.

(y) [real]

The output Y pixel coordinate.

EXAMPLES

1. Calculate (X,Y) in the first group of an image from RA/Dec:

  wf> rd2xy w1234567t.d0h 11:11:53 03:28:53

BUGS

SEE ALSO

xy2rd