skycoord_to_lmn

ska_sdp_func_python.util.coordinate_support.skycoord_to_lmn(pos: SkyCoord, phasecentre: SkyCoord)

Convert astropy sky coordinates into the l,m,n coordinate system relative to a phase centre.

The l,m,n is a RHS coordinate system with

• Its origin on the sky sphere

• m,n and the celestial north on the same plane

• l,m a tangential plane of the sky sphere.

Note that this means that l increases east-wards.

Parameters:

• pos – Position in SkyCoord

• phasecentre – Phase centre in SkyCoord

Returns:

lmn coordinates