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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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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

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
4.7684e-05 JED
period n/a
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  
   fit RMS      .67882  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2013-Dec-03 07:28:01  

Additional Information
 Earth MOID = .0227128 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 8.0 mag 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 ]
FirstGov 2016-May-04 07:56 UT
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