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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2456630.5 (2013-Dec-04.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000201003833968 2.127e-05  
a -61.95201446552018 6.5513 au
q .01245259242960607 8.7236e-07 au
i 62.40397752235779 0.00029292 deg
node 295.65203155 4.9602e-05 deg
peri 345.5312406205832 0.00063286 deg
M .01055365863920281 0.001674 deg
tp 2456625.278658273561
(2013-Nov-28.77865827)
4.7684e-05 TDB
period n/a
n/a
n/a
n/a
d
yr
n .002021254151162501 0.00032061 deg/d
Q n/a n/a au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 9.031169957376111E-8 1.952E-9
A2 [EST] 5.558424481809913E-9 5.324E-10
  Orbit Determination Parameters
   # obs. used (total)      6514  
   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-BIG16  
   norm. resid. RMS      .67882  
   source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2013-Dec-03 07:28:01  

Additional Information
 Earth MOID = .0227128 au 
 T_jup = 0.065 
[ hide covariance matrix ]
Orbit Covariance (8×8)
  e q tp node peri i A1 A2
e 4.52399616698506E-10 1.849798916511595E-11 -1.198022036845792E-10 3.968410333095936E-10 2.434533139789193E-10 -2.346360132422415E-9 -1.291235687818087E-14 1.132061345583716E-14
q 1.849798916511595E-11 7.610123755255186E-13 -7.018669791416188E-12 1.881554245161449E-11 4.082328563209476E-11 -1.111725381399892E-10 -6.212505154896683E-16 4.623218153186018E-16
tp -1.198022036845792E-10 -7.018669791416188E-12 2.27373696498549E-9 -1.887784829592012E-9 -2.954948973221459E-8 1.102358398711125E-8 8.963793220155004E-14 -2.483571330788786E-15
node 3.968410333095936E-10 1.881554245161449E-11 -1.887784829592012E-9 2.460356981274071E-9 2.560220752348836E-8 -1.447192839455705E-8 -8.689949317531586E-14 9.478000157490447E-15
peri 2.434533139789193E-10 4.082328563209476E-11 -2.954948973221459E-8 2.560220752348836E-8 4.005136375032139E-7 -1.494217364442531E-7 -1.180214538570806E-12 -9.012009371176091E-16
i -2.346360132422415E-9 -1.111725381399892E-10 1.102358398711125E-8 -1.447192839455705E-8 -1.494217364442531E-7 8.580477529523143E-8 5.082399883317928E-13 -5.607190211902954E-14
A1 -1.291235687818087E-14 -6.212505154896683E-16 8.963793220155004E-14 -8.689949317531586E-14 -1.180214538570806E-12 5.082399883317928E-13 3.810903166097041E-18 -3.025823547125611E-19
A2 1.132061345583716E-14 4.623218153186018E-16 -2.483571330788786E-15 9.478000157490447E-15 -9.012009371176091E-16 -5.607190211902954E-14 -3.025823547125611E-19 2.834036843944147E-19

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 8.0   1. 54 from 1160 observations, assumed slope, autocmod 2.5c
comet total magnitude slope K1 8.   n/a 54 autocmod 2.5c

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