Astrometry+RV joint fit implementation for a binary system using the framework of exoplanet.
exoplanet is a toolkit for probabilistic modeling of transit and/or radial velocity observations of exoplanets and other astronomical time series using PyMC3. PyMC3 is a flexible and high-performance model building language and inference engine that scales well to problems with a large number of parameters.
exoplanet extends PyMC3’s language to support many of the custom functions and distributions required when fitting exoplanet datasets. Details and documentation of exoplanet package can be found in https://docs.exoplanet.codes/en/stable/