Merge branch 'tickets/DM-38005'

config/latiss/calibrate.py

@@ -7,22 +7,29 @@
 # We often have very few sources due to smaller aperture so use affine task. 
 config.astrometry.wcsFitter.retarget(FitAffineWcsTask)
 
-# Increase maxoffset as AUXTEL pointing can be unreliable. Between Feb2020-Mar2022 we saw offsets
-# of up to 4 arcmin, which translates to 2400pix. We choose 3000 as a conservative limit. pixelMargin 
-# also increased to ensure refcat overlap when we see large pointing offsets considering a 3000pix 
-# offset and detector half-width of 2100pix. 
-config.astromRefObjLoader.pixelMargin = 900
-config.astrometry.matcher.maxOffsetPix = 3000
+# Note that the following two config values were validated on data taken in
+# 2022-11 and 2022-12, which is after some major improvements were made to
+# the pointing accuracy of AuxTel. The improvements came from updates made
+# in 2022-05 (with further improvements throughout the year). As such, these
+# configs are likely only appropriate for data starting from 2022-05. If
+# processing earlier data, these may need to be relaxed to the previous values
+# (pixelMargin = 900 & maxOffsetPix = 3000) to avoid astrometric fit failures.
+config.astromRefObjLoader.pixelMargin = 250
+config.astrometry.matcher.maxOffsetPix = 900
 
 # Apply a magnitude limit and decrease the SNR limit as we're only a 1.2m
-# and frequently take short exposures. Also, allow max rotation while the
-# instrumental repeatability isn't good.
+# and frequently take short exposures.
 config.astrometry.referenceSelector.doMagLimit = True
-config.astrometry.referenceSelector.magLimit.minimum = 1
+config.astrometry.referenceSelector.magLimit.minimum = 8
 config.astrometry.referenceSelector.magLimit.maximum = 18
 config.astrometry.referenceSelector.magLimit.fluxField = "phot_g_mean_flux"
-config.astrometry.matcher.maxRotationDeg = 5.99
+config.astrometry.matcher.maxRotationDeg = 2.0
+
 config.astrometry.sourceSelector['matcher'].minSnr = 10
 
+# Turn on reference vs. source magnitude outlier rejection to help avoid bad
+# matches.
+config.astrometry.doMagnitudeOutlierRejection = True
+
 # Write srcMatchFull
 config.doWriteMatchesDenormalized = True