positionRmsFromCat

lsst.validate.drp.util.positionRmsFromCat(cat)

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

Parameters:

cat : collection

Object with .get method for ‘coord_ra’, ‘coord_dec’ that returns radians.

Returns:

pos_rms : float

RMS scatter of positions in milliarcseconds.