[AstroPy] Conversion from a Cartesian representation to SkyCoord

[Tim Cornwell]

I'm working with some radio data in astropy. I need to convert to and from the l, m, n. Given a position on the sky, pos, I can calculate l, m, n as follows:

todc = pos.transform_to(phasecentre.skyoffset_frame())
dc = todc.represent_as(CartesianRepresentation)
l, m, n = dc.y.value, dc.z.value, dc.x.value - 1
How do I do the reverse operation? i.e. given a set of l, m, n defined with respect to phase centre how to get the SkyCoord? The easy part is the conversion between direction cosines and l, m, n:

dc = lm[2] + 1, lmn[0], lmn[1]
Thanks, Tim


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