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DM-8828: Support proper motions in reference catalogs #6

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Sep 6, 2018
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DM-8828: Support proper motions in reference catalogs #6

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10 changes: 9 additions & 1 deletion python/lsst/meas/extensions/astrometryNet/loadAstrometryNetObjects.py
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Expand Up @@ -81,13 +81,21 @@ def __init__(self, config=None, andConfig=None, **kwargs):
# because astrometry may not be used, in which case it may not be properly configured

@pipeBase.timeMethod
def loadSkyCircle(self, ctrCoord, radius, filterName=None):
def loadSkyCircle(self, ctrCoord, radius, filterName=None, epoch=None):
"""!Load reference objects that overlap a circular sky region

@param[in] ctrCoord center of search region (an afwGeom.Coord)
@param[in] radius radius of search region (an afwGeom.Angle)
@param[in] filterName name of filter, or None for the default filter;
used for flux values in case we have flux limits (which are not yet implemented)
@param[in] epoch Epoch for proper motion and parallax correction
(an astropy.time.Time), or None

No proper motion correction is made, since our astrometry.net catalogs
typically don't support that, and even if they do they format is uncertain.
Users interested in proper motion corrections should use the
lsst.meas.algorithms.LoadIndexedReferenceObjectsTask or they will need to
subclass and define how the proper motion correction is to be done.

@return an lsst.pipe.base.Struct containing:
- refCat a catalog of reference objects with the
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