Chandra X-Ray Observatory
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Last modified: 22 December 2016

URL: http://cxc.harvard.edu/ciao/bugs/celldetect.html

Bugs: celldetect


Table of Contents

Caveats

Bugs


Caveats

[New] (22 Dec 2016)RA_ERR and DEC_ERR values near poles

The RA_ERR and DEC_ERR values are approximations and become increasing inaccurate the closer to the poles, DEC=+/-90.

Users may also see incorrect values for these errors for RA values very near 0|360 such that the error bar crosses the boundary and wraps around.

Workaround:

The X_ERR and Y_ERR values in physical pixels is correct. Users can use these together with the known plate scale to compute their own error estimates.


Bugs

Autonaming of ASCII region files uses the .fits extension instead of .reg as would be expected.

In general, autonaming only works for simple cases.


Last modified: 22 December 2016
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