NAME:
rperi
PURPOSE:
calculate the pericenter radius
INPUT:
analytic - compute this analytically
pot - potential to use for analytical calculation
ro= (Object-wide default) physical scale for distances to use to convert
use_physical= use to override Object-wide default for using a physical scale for output
OUTPUT:
R_peri
HISTORY:
2010-09-20 - Written - Bovy (NYU)
