Status

The actual HRMA on-orbit focal length is 10070 +/- 3mm (90% interval including systematic uncertainties). The official determination and announcement are posted below.

The GEOM file produces acceptable sky coordinates for all detectors; the residual errors are well within 1" in the areas normally used for imaging observations.

Analysis:

• HRMA On-orbit Focal Length -- Ping Zhao, 8/9/00
• HRMA Focal Length -- Maxim Markevitch, 12/1/01
• Plate Scale and Relative Chip Postions (with new GEOM file) -- Maxim Markevitch, 12/3/01

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.    Email: cxcweb@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2004. All rights reserved.