C/2012 S1 (ISON) - orbits A1-1, A5-1 and A5-2

Orbit of C/2012 S1 ISON - historical solutions

Pure gravitational nominal solution for weighted data (Solution A5-1):

   Observational arc:        2011 Dec.  28 - 2013 Jan. 24  
   Number of observations:   1662  
   RMS:                      0.27 arcsec (3263 residuals used, 1.8% rejected residuals ) 

Heliocentric osculating orbit

  Epoch        Perihelion time     q              e            ω           Ω           i      
  2012 11 28   20131128.8113   0.01251395     1.00000281   345.50171   295.74953    61.79227        
                    ± 0.0018   0.00000037     0.00000008     0.00015     0.00024     0.00137         

  NG parameters:   
   A1 = 0 
   A2 = 0  
   A3 = 0  

Barycentric nominal original orbit (at 250 AU from the Sun), obtained from the above elements

  Epoch        Perihelion time     q             e            ω            Ω           i      
  1717 03 20   20131128.7260   0.01238276    0.99999964   345.52334   295.77190    61.79007        
                    ± 0.0028   0.00000037    0.00000012     0.00015     0.00024     0.00137         
   1/aori =  (+29.02 ± 6.63)×10-6 AU-1    

For comparison, the gravitational nominal solution for non-weighted data (Solution A1-1):

   Observational arc:        2011 Dec.  28 - 2013 Jan. 24  
   Number of observations:   1662  
   RMS:                      0.40 arcsec (3257 residuals used, 2.0% rejected residuals ) 

Heliocentric osculating orbit

  Epoch        Perihelion time     q                 e                 ω              Ω              i      
  2012 11 28   20131128.81620994   0.01251389700     1.00000261192   345.50171230   295.74978565    61.79076987        
                    ± 0.00219781   0.00000042650     0.00000009356     0.00015987     0.00025346     0.00143148         

  NG parameters:   
   A1 = 0 
   A2 = 0  
   A3 = 0  

Barycentric nominal original orbit (at 250 AU from the Sun)

  Epoch        Perihelion time     q                e                 ω               Ω              i      
  1716 12 30   20131128.73100821   0.01238269619    0.99999944347   345.52334437   295.77216198    61.78857615        
                    ± 0.00224276   0.00000042904    0.00000008297     0.00015811     0.00025378     0.00143237         
   1/aori =  (+44.93 ± 7.49)×10-6 AU-1  

Pure gravitational nominal solution for weighted data (Solution A5-2):

   Observational arc:        2011 Dec.  28 - 2013 Mar. 17 
   Number of observations:   3189  
   RMS:                      0.32 arcsec (6284 residuals used, 1.5% rejected residuals ) 

Heliocentric osculating orbit

  Epoch        Perihelion time              q                 e              ω                Ω             i      
  2012 11 28   20131128.794258130   0.012510739735     1.000003625662   345.502937001   295.747437843    61.804103410        
                    ± 0.000484676   0.000000271399     0.000000034762     0.000133664     0.000191930     0.001090774         

  NG parameters:   
   A1 = 0 
   A2 = 0  
   A3 = 0     

Barycentric nominal original orbit (at 250 AU from the Sun), obtained from the above elements

  Epoch        Perihelion time        q               e               ω              Ω              i      
 1717 11 15   20131128.70850676   0.01237960876   1.00000044647   345.52456942   295.76980842    61.80191841 
                    ±0.00050085   0.00000027717   0.00000005771     0.00013812     0.00019880     0.00112649 
   1/aori = (-36.06 ± 2.79)×10-6 AU-1   

≡