DEIMOS user script gcent

Name

gcent -- move an object to the center of the guider pickoff mirror

Purpose

Given the pixel coordinates of an object on a DEIMOS guider image,
compute and apply the required telescope move to bring the
object to the center of the field of view for the DEIMOS TV
guider pickoff mirror (pixel coordinates x=512, y=800).

Usage

gcent [-n] x y

Arguments

-n = no move, only print the required shift
x = column location of object [pixels]
y = row location of object [pixels]

Output

Exit values

0 = normal completion
1 = wrong number of arguments

Example

1) Move a target at pixel (100,200) to the pickoff mirror center:
gcent 100 200

2) Display the telescope move required to shift a target at
pixel (100,200) to the pickoff mirror center, without
actually performing the move:
gcent -n 100 200