galpy.util.coords.radec_to_custom¶

galpy.util.coords.radec_to_custom(ra, dec, T=None, degree=False)[source]¶

Transform from equatorial coordinates to a custom set of sky coordinates

Parameters:

ra (float or numpy.ndarray) – Right ascension.
dec (float or numpy.ndarray) – Declination.
T (numpy.ndarray, optional) – Matrix defining the transformation: 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 (bool, optional) – If True, ra and dec are given in degree and l and b will be as well.

Returns:

(custom longitude, custom latitude) (with longitude -180 to 180)

Return type:

tuple

Notes

2009-11-12 - Written - Bovy (NYU)
2014-06-14 - Re-written w/ numpy functions for speed and w/ decorators for beauty - Bovy (IAS)
2019-03-02 - adjusted angle ranges - Nathaniel (UofT)