[AstroPy] Centering saturated images

Ian Crossfield ianc at mpia-hd.mpg.de
Tue Jul 30 08:54:56 EDT 2013


A few ideas:
--One possibility might be to use a "least-asymmetry" centering approach 
after masking out the saturated pixels (described, at least briefly, in 
--If your sources are bright enough to show diffraction spikes, these 
should go through the PSF center and you may be able to calculate a 
centroid from this.

Good luck,
-Ian Crossfield

On 7/30/13 2:19 PM, Maria de Juan Ovelar wrote:
> Dear AstroPy-ers,
> I am a PhD student working on imaging polarimetry.
> Sorry if this is a too basic question for the mailing list but I would like to know what is, in your opinion, the best way to center images that have the central ~20 pixels saturated and if there are tools in python that can help wit this specific task.
> Me and another student were playing a bit with fitting a moffat profile (with saturated pixels masked) but it seems that it is not accurate enough.
> Any ideas? would a cross-correlation work better? and do the cross-correlation work with saturated pixels masked?
> Thank you very much!
> Maria
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Ian Crossfield
Max-Planck-Institut für Astronomie
+49-(0)6221 528-405
Room 308/4

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