Help: CAPTURE a neutral or enemy planet

Syntax:  CApture [Absolute|Relative] <vpos> <hpos>

At the start of the game, all planets are neutral (they fire  at
everyone!).   Once  captured  by  either side, they fire only at
enemy ships, and can be DOCKed at to refuel and rearm, just like
a  base (except a planet can only supply half the resources that
a  base  can).   Enemy  planets  can  also  be  captured.   When
capturing an enemy planet, 1 second is added to the normal pause
time of 5 seconds for each BUILD present.   Also,  50  units  of
ship energy are lost for each build.

Examples:

CA 12 32        Capture planet at 12-32.
CA A 12 32      Equivalent to "CA 12 32".
CA R 1 1        Capture planet at sector 12-32, if your present
                location is 11-31.