Planet brightness temperatures in CASA

##
Planet brightness temperatures in CASA

For comparison, we describe here the planet brightness models used in CASA. The planet models used in CASA are described in the ALMA report 784, by B. Butler.

In Summary:

- Mercury: No model for Mercury
- Venus: Table based on model by Clancy et al. 2012.
- Mars: CASA makes use of tabulated brightness temperature values computed by a full implementation of a physical and radiative transfer model (based on Rudy et al. 1987), for which an online implementation was made by B. Butler from NRAO.
  (http://www.aoc.nrao.edu/ bbutler/work/mars/model/)
- Jupiter: Table based on G. Orton model
- Saturn: No model for Saturn
- Uranus: Table based on G. Orton and R. Moreno models (ESA4)
- Neptune: Table based on G. Orton and R. Moreno models (ESA3)