Check for aspect offset and fix

The tool to generate commands to correct for aspect offsets is no longer available.

There is no longer a need to correct the astrometry in Chandra data taken from the CXC archive, with the possible exception of the following obsids: 12, 82, 400, 526, and 1456. These obsids (mostly from 1999) all have known issues that prevent normal reprocessing.

If you are analyzing one of the listed observations and require high-precision astrometry then please contact the CXC help desk.

COMMENTS, QUESTIONS, ERRORS: Please send mail to Aspect Help