Important note: this document is now obsolete

In April 2003, we determined more accurately what the pixel pointing offsets were. The information below is thus obsolete. But we are saving it because it was used to calculate initial offsets for Carina polarimetry of SE, SW, etc. positions.

Definitions:

The CDDC's and CTC's are meant to set up the pointing so that pixel 5 is centered on the ASC, or actual source coordinate. If you want some other pixel to be centered on the ASC, then you have to add the pixel pointing offset for that pixel. The pixel pointing offsets are tabulated below, assuming a 3.1 arcmin pixel separation and a 26 degree rotation of the array on the sky. These figures were arrived at by a simple average of the theoretically expected values (2.94 arcmin/pixel and 22 degrees) and the values measured at Pole in Fall 2001 (3.28 arcmin/pixel and 29.5 degrees; see SPARO logbook 6, page 130).

Note that the pixel pointing offsets are in real degrees, not degrees of azimuth. CDCC's are by convention stated in degrees of azimuth.