AnalyticAstrometryModel¶
-
class
lsst.validate.drp.matchreduce.
AnalyticAstrometryModel
(matchedMultiVisitDataset, brightSnr=100, medianRef=100, matchRef=500)[source]¶ Bases:
lsst.validate.drp.base.BlobBase
Serializable model of astronometry errors across multiple visits.
astromRms=Cheta/SNR+σsysParameters: matchedMultiVisitDataset : MatchedMultiVisitDataset
A dataset containing matched statistics for stars across multiple visits.
brightSnr : float, optional
Minimum SNR for a star to be considered “bright”.
medianRef : float, optional
Median reference astrometric scatter in millimagnitudes
matchRef : int, optional
Should match at least matchRef stars.
Notes
- The scatter and match defaults are appropriate to SDSS are the defaults
- for medianRef and matchRef
For SDSS, stars with mag < 19.5 should be completely well measured.
Attributes
brightSnr (float) Threshold SNR for bright sources used in this model. C (float) Model scaling factor. theta (float) Seeing (milliarcsecond). sigmaSys (float) Systematic error floor (milliarcsecond). astromRms (float) Astrometric scatter (RMS) for good stars (milliarcsecond).