Perturbed Orbital Elements
CALL sla_PERTEL (JFORM, DATE0, DATE1,
EPOCH0, ORBI0, ANODE0, PERIH0, AORQ0, E0, AM0,
EPOCH1, ORBI1, ANODE1, PERIH1, AORQ1, E1, AM1,
JSTAT)
JFORM  I  choice of element set (2 or 3; Note 1) 
 
DATE0  D  date of osculation (TT MJD) for the given 
 

 elements 


DATE1  D  date of osculation (TT MJD) for the updated 



 elements 
EPOCH0  D  epoch of the given element set (${t}_{0}$ or $T$, TT MJD; 
 

 Note 2) 
 
ORBI0  D  inclination ($i$, radians) 
 
ANODE0  D  longitude of the ascending node ($\Omega $, radians) 


PERIH0  D  argument of perihelion ($\omega $, radians) 


AORQ0  D  mean distance or perihelion distance ($a$ or $q$, AU) 


E0  D  eccentricity ($e$) 


AM0  D  mean anomaly ($M$, radians, JFORM=2 only) 
EPOCH1  D  epoch of the updated element set (${t}_{0}$ or $T$, 
 

 TT MJD; Note 2) 
 
ORBI1  D  inclination ($i$, radians) 
 
ANODE1  D  longitude of the ascending node ($\Omega $, radians) 
 
PERIH1  D  argument of perihelion ($\omega $, radians) 


AORQ1  D  mean distance or perihelion distance ($a$ or $q$, AU) 


E1  D  eccentricity ($e$) 


AM1  D  mean anomaly ($M$, radians, JFORM=2 only) 
JSTAT  I  status: 
 

 +102 = warning, distant epoch 
 

 +101 = warning, large timespan ($>100$ years) 
 

 +1 to +10 = coincident with major planet (Note 6) 
 

 0 = OK 
 

 $$1 = illegal JFORM 



 $$2 = illegal E0 



 $$3 = illegal AORQ0 



 $$4 = internal error 



 $$5 = numerical error 
JFORM=2, suitable for minor planets:
EPOCH  =  epoch of elements ${t}_{0}$ (TT MJD)  
ORBINC  =  inclination $i$ (radians)  
ANODE  =  longitude of the ascending node $\Omega $ (radians)  
PERIH  =  argument of perihelion $\omega $ (radians)  
AORQ  =  mean distance $a$ (AU)  
E  =  eccentricity $e$$\left(0\le e<1\right)$  
AORL  =  mean anomaly $M$ (radians) 
JFORM=3, suitable for comets:
EPOCH  =  epoch of perihelion $T$ (TT MJD)  
ORBINC  =  inclination $i$ (radians)  
ANODE  =  longitude of the ascending node $\Omega $ (radians)  
PERIH  =  argument of perihelion $\omega $ (radians)  
AORQ  =  perihelion distance $q$ (AU)  
E  =  eccentricity $e$$\left(0\le e\le 10\right)$ 