---
name: "skycoor"
section: "1"
platform: "linux"
package: "wcstools"
version: "3.9.7-1.1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/skycoor"
---

# skycoor(1)

Convert coordinates

## Name

skycoor - Convert coordinates

## Synopsis

skycoor \[-bdgjv\] \[-n ndec\] ra1 dec1 sys1 ... ran decn sysn\
 or\
 skycoor \[-vbjg\] \[-n ndec\] @listfile

## Description

*skycoor* converts coordinates between the J2000, B1950, and galactic coordinate systems, rounding to a specified number of decimal places and printing in degrees or hh:mm:ss.sss dd:mm:ss.sss.  Input coordinates may also be in either format, and the system (J2000, B1950, or galactic) may be in upper or lower case.  No spaces are allowed within  the individual coordinates

## Options

- **-b**

  B1950 (FK4) output

- **-d**

  RA and Dec output in degrees

- **-e**

  Ecliptic longitude and latitude output

- **-g**

  Galactic longitude and latitude output

- **-i r\|d\|**

  Input units (r=radians, d=degrees, else hh:mm:sss dd:mm:sss)

- **-j**

  J2000 (FK5) output

- **-n \<num\>**

  Number of decimal places in output RA seconds

- **-o \<num\>**

  Offset coordinates by this many arcseconds

- **-p**

  RA and Dec proper motion in milliarcseconds/year

- **-q**

  Output system, including equinox

- **-r \<RA\> \<Dec\> \<RA\> \<Dec\>**

  Angular separation between two RA, Dec pairs

- **-s**

  Output ra= dec= epoch= radecsys= for sethead

- **-v**

  Print more intermediate information

- **-w**

  Convert RA, Dec equatorial coordinates to x,y,z

- **-x**

  Convert x,y,z equatorial coordinates to RA, Dec

- **-y \<epoch\>**

  Epoch of coordinates in years

## Author

Jessica Mink, SAO (jmink@cfa.harvard.edu)