Changeset 39917 for branches/czw_branch/20160809/Ohana

Timestamp:

Jan 6, 2017, 10:52:30 AM (10 years ago)

Author:

eugene

Message:

for ra:offset, we need to correct for cos(dec)

File:

• branches/czw_branch/20160809/Ohana/src/libdvo/src/dbExtractMeasures.c (modified) (1 diff)

branches/czw_branch/20160809/Ohana/src/libdvo/src/dbExtractMeasures.c

@@ -461 +461 @@
       break;
     case MEAS_RA_FIT_OFFSET: /* OK */
+      // RA_epoch_fit = RA_mean + uR*(t - Tmean)/cos(dec) + plx*parR 
+      // note that this extraction ignores parallax
       dT = (measure[0].t - average[0].Tmean) / (86400*365.25);
-      dR = dvoOffsetR (measure, average);
-      value.Flt = dR - average[0].uR * dT;
+      dR = dvoOffsetR (measure, average); // RA_epoch - RA_mean (** NOT local linear distance **)
+      value.Flt = dR*cos(RAD_DEG*measure[0].D) - average[0].uR * dT;
+      // this is the local linear distance of the measurement from the fit 
       break;
     case MEAS_DEC_FIT_OFFSET: /* OK */