$\left[\phantom{\rule{0.3em}{0ex}}\alpha ,\delta \phantom{\rule{0.3em}{0ex}}\right]$ from Universal Elements
CALL sla_PLANTU (DATE, ELONG, PHI, U, RA, DEC, R, JSTAT)
DATE  D  TT MJD of observation (JD$$2400000.5) 


ELONG,PHI  D  observer’s longitude (east +ve) and latitude 



 radians) 
U  D(13)  universal orbital elements 


(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 
RA,DEC  D  topocentric apparent $\left[\phantom{\rule{0.3em}{0ex}}\alpha ,\delta \phantom{\rule{0.3em}{0ex}}\right]$ (radians) 
 
R  D  distance from observer (AU) 
 
JSTAT  I  status: 
 

 0 = OK 



 $$1 = radius vector zero 



 $$2 = failed to converge 