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C/2012 S1 (ISON)
Classification: Hyperbolic Comet          SPK-ID: 1003203
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456413.5 (2013-May-01.0) TDB
Reference: JPL 55 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000005095700877 1.6092e-08  
a -2446.515869432519 7.7289 au
q .01246671306154389 1.0063e-07 au
i 62.16289448145616 0.00032658 deg
node 295.6865417212286 5.5497e-05 deg
peri 345.5411989977785 4.3516e-05 deg
M -.001724786075348974 8.1729e-06 deg
tp 2456625.264530258320
(2013-Nov-28.76453026)
7.9908e-05 TDB
period n/a
n/a
n/a
n/a
d
yr
n 8.144829888390664E-6 3.8596e-08 deg/d
Q n/a n/a au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 8.539073016664726E-8 2.168E-9
A2 [EST] 5.751266901683991E-9 6.145E-10
  Orbit Determination Parameters
   # obs. used (total)      6682  
   data-arc span      784 days (2.15 yr)  
   first obs. used      2011-09-30  
   last obs. used      2013-11-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .57173  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 11:00:42  

Additional Information
 Earth MOID = .0229939 au 
 Jupiter MOID = .68569 au 
 T_jup = 0.065 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 8.8   0.9 55 2 parameter fit from 1211 observations, autocmod 2.8
comet total magnitude slope K1 6.75   n/a 55 autocmod 2.8

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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