---
name: "fit-wcs"
section: "1"
platform: "linux"
package: "astrometry.net"
version: "0.97+dfsg-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/fit-wcs"
---

# fit-wcs(1)

Fit a transformation from x,y and matching RA,DEC coordinates

## NAME

fit-wcs - Fit a transformation from x,y and matching RA,DEC coordinates

## SYNOPSIS

**fit-wcs** \[options\] **-x** file **-r file**\
 **fit-wcs** \[options\] **-c** file

## DESCRIPTION

Given a list of x,y coordinates and matching RA,Dec coordinates, fit a transformation and produce a WCS file

## OPTIONS

- **-x** *file*

  XYls input file

- **-X** *name*

  X column name (default: FIELD\_X)

- **-Y** *name*

  Y column name (default: FIELD\_Y)

- **-r** *file*

  RDls input file

- **-R** *name*

  RA column name (default: INDEX\_RA)

- **-D** *name*

  Dec column name (default: INDEX\_DEC)

- **-c** *file*

  Correspondences file

- **-o** *file*

  WCS output file

- **-s** *sip*

  **SIP order (default is a WCS TAN solution, not SIP)**

- **-W** *width*

  **Image width (default: max X position; used for SIP)**

- **-H** *height*

  **Image height (default: max Y position; used for SIP)**

- **-C**

  Set CRPIX to be the center of the field; SIP only

- **-v**

  **Verbose**

## AUTHOR

**The Astrometry.net team. Principal investigators are David W. Hogg (NYU) and** **Dustin Lang (CMU).**

## SEE ALSO

**http://astrometry.net**