Conventional to Universal Elements
CALL sla_EL2UE (DATE, JFORM, EPOCH, ORBINC, ANODE,
PERIH, AORQ, E, AORL, DM,
U, JSTAT)
DATE  D  epoch (TT MJD) of osculation (Note 3) 
 
JFORM  I  choice of element set (13; Note 6) 
 
EPOCH  D  epoch of elements (${t}_{0}$ or $T$, TT MJD) 
 
ORBINC  D  inclination ($i$, radians) 
 
ANODE  D  longitude of the ascending node ($\Omega $, radians) 
 
PERIH  D  longitude or argument of perihelion ($\varpi $ or $\omega $, 



 radians) 


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


E  D  eccentricity ($e$) 


AORL  D  mean anomaly or longitude ($M$ or $L$, radians, 



 JFORM=1,2 only) 


DM  D  daily motion ($n$, radians, JFORM=1 only) 
U  D(13)  universal orbital elements (Note 1) 
 
(1) 
 combined mass ($M+m$) 
(2) 
 total energy of the orbit ($\alpha $) 
(3) 
 reference (osculating) epoch (${t}_{0}$) 
(46) 
 position at reference epoch (${r}_{0}$) 
(79) 
 velocity at reference epoch (${v}_{0}$) 
(10) 
 heliocentric distance at reference epoch 
(11) 
 ${r}_{0}.{v}_{0}$ 
(12) 
 date ($t$) 
(13) 
 universal eccentric anomaly ($\psi $) of date, approx 


JSTAT  I  status: 



 0 = OK 



 $$1 = illegal JFORM 



 $$2 = illegal E 



 $$3 = illegal AORQ 



 $$4 = illegal DM 



 $$5 = numerical error 
JFORM=1, suitable for the major planets:
EPOCH  =  epoch of elements ${t}_{0}$ (TT MJD)  
ORBINC  =  inclination $i$ (radians)  
ANODE  =  longitude of the ascending node $\Omega $ (radians)  
PERIH  =  longitude of perihelion $\varpi $ (radians)  
AORQ  =  mean distance $a$ (AU)  
E  =  eccentricity $e$$\left(0\le e<1\right)$  
AORL  =  mean longitude $L$ (radians)  
DM  =  daily motion $n$ (radians) 
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)$ 