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C/2013 A1 (Siding Spring)
Classification: Hyperbolic Comet          SPK-ID: 1003228
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 2456856.5 (2014-Jul-18.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000816933182525 1.6368e-06  
a -1712.094263295657 3.4299 au
q 1.398666615296847 7.1476e-07 au
i 129.0273370046038 3.0709e-05 deg
node 300.977577224005 2.5711e-05 deg
peri 2.438201616733036 6.0399e-05 deg
M -.001381790545265815 4.1514e-06 deg
tp 2456955.818385464114
9.6177e-05 JED
period n/a
n 1.391273668826491E-5 4.1808e-08 deg/d
Q n/a n/a au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
AJ1 [EST] 8.64740053885358E-8 5.188E-9
AJ2 [EST] 1.531798221949802E-7 6.677E-8
ALF [EST] 62.80861260697498 7.036
DEL [EST] 13.53441757261824 14.34
DTH [EST] 9.37787873799622 1.625
ET1 [EST] 60.22905453421588 3.111
ET2 [EST] 152.3519710150262 4.773
  Orbit Determination Parameters
   # obs. used (total)      437  
   data-arc span      936 days (2.56 yr)  
   first obs. used      2012-10-04  
   last obs. used      2015-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   fit RMS      .28822  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2015-Jun-05 12:33:32  

Additional Information
 Earth MOID = .383246 au 
 T_jup = -0.919 
 Orbital solution described in Farnocchia et al. 2015 
[ 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 8.5 mag 2. 102 from 368 observations, assumed slope, autocmod 2.6
comet total magnitude slope K1 9.   n/a 102 autocmod 2.6

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
FirstGov 2016-Feb-12 05:42 UT
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