I have a set of dates, position angles ($\theta$) and angular separations ($\rho$) for visual binary star. For example:
1994.3132 57.0 0.097 1996.1783 73.4 0.051 2006.1938 182.0 0.126 2009.2597 192.9 0.152 etc.
What are algorithms to calculate orbital elements and to plot the orbit of the binary star?
Are there available codes (or programs) for this calculations? Python is preferable )