skycoor - Man Page

Convert coordinates


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


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



B1950 (FK4) output


RA and Dec output in degrees


Ecliptic longitude and latitude output


Galactic longitude and latitude output

-i r|d|

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


J2000 (FK5) output

-n <num>

Number of decimal places in output RA seconds

-o <num>

Offset coordinates by this many arcseconds


RA and Dec proper motion in milliarcseconds/year


Output system, including equinox

-r <RA> <Dec> <RA> <Dec>

Angular separation between two RA, Dec pairs


Output ra= dec= epoch= radecsys= for sethead


Print more intermediate information


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


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

-y <epoch>

Epoch of coordinates in years


Jessica Mink, SAO (


9 November 2001