Change the tracking offsets of specified telescope axes.

Optional qualifier arguments:

/add

If this modifier is present the offsets will be added to the existing offsets. Otherwise they will replace them.

Mandatory arguments:

(none)

Optional Arguments:

PointingOffset az

The offset to substitute for or add to the current azimuth offset.

PointingOffset el

The offset to substitute for or add to the current elevation offset.

PointingOffset dk

The offset to substitute for or add to the current deck-angle offset.

Example:

The following example adds an additional 10 arcseconds to the pointing offset of the azimuth, and 0.02 degrees to the offset of the elevation axis.

  offset/add az=0:0:10, el=0.02

Example:

The following example sets the total pointing offset of the deck axis to -50 degrees.

  offset dk=-50

Context:

There are two common reasons to add az,el offsets to the expected position of a source.

1. If the position of a source isn't known very accurately or the pointing model needs adjustment, the source won't end up precisely in the center of the field of view. Offsets can then be used to peak up on the source.
2. During calibration procedures, offsets are used to briefly move the telescope off source.

The deck-rotation offset determines the orientation of the field of view while tracking a source.

The offsets are added after applying all other corrections.