data in corr file

[Gaetano Zarcone]

Hello,

once I retrive the corr file, I find following data:

           index_id    field_id            match_weight              FLUX      BACKGROUND
   1          16           0             0.999905578299696        43827.8        5980.33
   2          17           2             0.999932903214945        15657.2        6087.91
   3          18           3             0.999865614862195        14874.4        6733.35

  ....

could someone explain me the meaning of each variable (index_id, field_id ecc..)?
Mostly, I'd like to know how to compute the FLUX. Is it a mean of star pixel or something else?

Thanks

[Dustin Lang]

Hi,

Sorry for my slow reply...  index_id would be an index into the *.rdls file, while field_id is an index into the *.axy file.  match_weight is whether we think it's a true match or a coincidence.  Flux is a very very simple estimate of the brightness of the star -- looks like it's based on just a single nearest-to-center pixel estimate of the background-subtracted brightness.  For astrometry, we don't need good flux estimates, just enough to roughly sort them.

cheers,

--dustin

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