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henyey - search for periodic orbits in a potential (Henyey’s method)
henyey [parameter=value] 
henyey compute periodic orbits
using the Henyey method of searching for periodic solutions of a system
of  differential equations in an (optionally rotating) 2D potential. 
The
method has been used first by T.S. v. Albada &  R.H. Sanders (1982) MNRAS, 201,
303.  For more details see also: Henyey (1964) ApJ 139, 309 
Note: this program
is under construction, and should not be used without consultation with
the author 
The following parameters are recognized in any order
if the keyword is also given: 
- x0= 
- Initial x coordinate      
- y0= 
- Initial
y coordinate      
- u0= 
- Initial u velocity      
- v0= 
- Initial v velocity  
   
- per= 
- Period        
- type= 
- Type of orbit {1,2,3}     
- ome= 
- Pattern speed
of potential     
- norbit= 
- Number of orbits to compute    
- step= 
- Step to increase
non-zero position    
perorb(1NEMO)
 
Peter Teuben, Tjeerd van
Albada
1980?          original version            TVA
1981?         Cyber7600 version - sheltran    PJT
xx-may-92    V0.0 ported to NEMO         PJT
xx-mar-03    V0.01 .. and still working ..    PJT
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