Data processing of SPHERE data: Frequently asked questions
- I do not have OBJECT,CENTER observations - can I use the bright spot near the center of the coronagraph as object position?
Answer: The bright spot is not caused by stellar light coming through the coronagraph, but by a diffraction effect known as Arago spot or Fresnel bright spot. It does therefore not indicate the center position of the object and you should not use it as such.
- Are there any colour transformations available for the SPHERE filters and another filter system?
Answer: SPHERE imaging data are not flux calibrated, therefore there is no conversion to other photometric systems available.
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