positionRms¶

lsst.validate.drp.matchreduce.positionRms(cat)[source]¶

Calculate the RMS for RA, Dec for a set of observations an object.

Parameters:

cat – collection with a .get method

for ‘coord_ra’, ‘coord_dec’ that returns radians.

Returns:

pos_rms – RMS of positions in milliarcsecond. Float.

This routine doesn’t handle wrap-around