galpy.util.coords.custom_to_pmrapmdec

galpy.util.coords.custom_to_pmrapmdec(pmphi1, pmphi2, phi1, phi2, T=None, degree=False)[source]

NAME:

custom_to_pmrapmdec

PURPOSE:

rotate proper motions in a custom set of sky coordinates (phi1,phi2) to ICRS (ra,dec)

INPUT:

pmphi1 - proper motion in custom (multplied with cos(phi2)) [mas/yr]

pmphi2 - proper motion in phi2 [mas/yr]

phi1 - custom longitude

phi2 - custom latitude

T= matrix defining the transformation in cartesian coordinates:
new_rect = T dot old_rect where old_rect = [cos(dec)cos(ra), cos(dec)sin(ra), sin(dec)] and similar for new_rect

degree= (False) if True, phi1 and phi2 are given in degrees (default=False)

OUTPUT:

(pmra x cos(dec), dec) for vector inputs [:,2]

HISTORY:

2019-03-02 - Written - Nathaniel Starkman (UofT)