galpy.util.bovy_coords.radec_to_lb¶
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galpy.util.bovy_coords.
radec_to_lb
(ra, dec, degree=False, epoch=2000.0)¶ NAME:
radec_to_lbPURPOSE:
transform from equatorial coordinates to Galactic coordinatesINPUT:
ra - right ascension
dec - declination
degree - (Bool) if True, ra and dec are given in degree and l and b will be as well
epoch - epoch of ra,dec (right now only 2000.0 and 1950.0 are supported when not using astropy’s transformations internally; when internally using astropy’s coordinate transformations, epoch can be None for ICRS, ‘JXXXX’ for FK5, and ‘BXXXX’ for FK4)
OUTPUT:
l,b
For vector inputs [:,2]
HISTORY:
2009-11-12 - Written - Bovy (NYU)
2014-06-14 - Re-written w/ numpy functions for speed and w/ decorators for beauty - Bovy (IAS)
2016-05-13 - Added support for using astropy’s coordinate transformations and for non-standard epochs - Bovy (UofT)