kathy=-1  azimuth,elevation observation (topocentric)
kathy= 0  meridian circle observation (geocentric referred
to true equinox and equator of date)
kathy= 1  photographic observation (topocentric without
elliptic aberration removed referred to the mean
equinox and equator of ref. epoch) (astrometric)
kathy= 2  photographic observation (topocentric with
all aberration removed referred to the mean
equinox and equator of ref. epoch) (astrographic)