Examples of Position Offset


 

Position offset due to a CCD gap:

[000461-PN] [000461-PN] [000461-PN]
 EPIC PN image (netscape)  EPIC PN image (ds9)  EPIC PN image with sources overlaid (ds9): The fat green circle has the source comment 'Position offset'. The small yellow circles are detections in M1 and M2 and confirm the slight offset.
 

 

Position offset close to a brighter source

[000930-PN] [000930-PN] [000930-PN]
 EPIC PN image (netscape)  EPIC PN image (ds9)  EPIC PN image with sources overlaid (ds9): The fat green circle has the source comment 'Position offset'. The small yellow circles are detections in M1 and M2 and confirm the slight offset.
 

 

Position offset of a bright source beyond the edge of a CCD:

[000393-M2] [000393-M2] [000393-M2]
 EPIC M2 image (netscape)  EPIC M2 image (ds9)  EPIC M2 image with sources overlaid (ds9): The fat green circle has the source comment 'Position offset'. The small yellow circles are detections in M1 and show the considerable offset of this detection. The detection could also be flagged as false with the comment 'Wing of bright src'.
 
 
in M1 for comparison:  
[000393-M1]
 EPIC M1 image (ds9)  


Screening Notes Example: Version 29.05.2003