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Uses the CASA measures tool to convert a topocentric frequency and observing date/direction to the corresponding frequency in the LSRK frame. See also restToLSRK, restToTopo, and topoToRest.


au.topoToLSRK(topoFrequency, datestring, ra, dec, equinox='J2000', observatory='ALMA', prec=4, verbose=False)
  • topoFrequency: floating point value in Hz or GHz, or a string with units
  • datestring: "YYYY/MM/DD/HH:MM:SS"
  • ra: string "HH:MM:SS.SSSS"
  • dec: string "DD.MM.SS.SSSS" or "DD:MM:SS.SSSS" (colons will be replaced with .)
  • prec: only used to display the value when verbose=True
Returns: the LSRK frequency in Hz


CASA <7>: au.topoToLSRK(230.543382943, -7, '2015-10-10-10:12:00','05:35:20','-05:00:20')
Warning: replacing colons with decimals in the dec field.
Warning: replacing colons with decimals in the dec field.
  Out[7]: 230538939248.20093

-- ToddHunter - 2016-05-11
Topic revision: r1 - 2016-05-11, ToddHunter
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