Changes between Version 53 and Version 54 of Sa10Problems

Timestamp:

Dec 13, 2012, 11:20:59 AM (14 years ago)

Author:

eugene

Comment:

--

Sa10Problems

@@ -104 +104 @@
   *  B5. psflikelihood: why <0 for 10% of the stackdetections and -999 for ~25% of the stackdetections 
     * a. '''EAM : note the definition from wiki:ippToPsps_Stack : sign(EXT_NSIGMA)*erfc(abs(EXT_NSIGMA) / sqrt(2)).  the value is negative if EXT_NSIGMA is in the direction of objects smaller than a PSF'''
+    * b. '''EAM : EXT_NSIGMA can be NaN (and thus result in -999 for psflikelihood) if any of psfMag, psfMagErr or kronMag are NaN (insignificant source).'''
 * C. PSPS flags: 
  *  C1. objectxflags: what does ID_SECF_HAS_STACK correspond to: forced photometry on the stack if set? Not clear why it should indicate whether there is a stack photometry as if there isn't any, then the corresponding photometry column should be set to -999