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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
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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 is not working, here are some notes that might help.
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 2457480.5 (2016-Apr-02.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000085526301256 2.8601e-06  
a -16366.48574855812 547.3 au
q 1.399764990633582 1.2332e-06 au
i 129.0329176101494 2.0974e-05 deg
node 300.9994099243701 0.00011762 deg
peri 2.449169482138664 7.3405e-05 deg
M .0002470499453610851 1.2392e-05 deg
tp 2456955.675811088666
0.0001338 TDB
period n/a
n 4.707289613947705E-7 2.3612e-08 deg/d
Q n/a n/a au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
AJ1 [EST] 8.332797598358188E-8 3.877E-9
AJ2 [EST] 1.857140671424592E-7 5.099E-8
ALF [EST] 68.42599143656125 6.618
DEL [EST] 17.2325492121477 8.506
DTH [EST] 7.940553933291362 1.464
ET1 [EST] 57.8449393653458 2.069
ET2 [EST] 149.0589506591809 4.181
  Orbit Determination Parameters
   # obs. used (total)      449  
   data-arc span      1291 days (3.53 yr)  
   first obs. used      2012-10-04  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   norm. resid. RMS      .30255  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2016-Apr-22 14:11:17  

Additional Information
 Earth MOID = .383565 au 
 Jupiter MOID = 3.6748 au 
 T_jup = -0.919 
[ 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   2. 105 from 467 observations, assumed slope, autocmod 2.6f
comet total magnitude slope K1 9.   n/a 105 autocmod 2.6f
comet nuclear magnitude M2 12.0   1. 105 from 2074 observations, autocmod 2.6f
comet nuclear magnitude slope K2 5.   n/a 105 autocmod 2.6f
comet nuclear phase coefficient PC 0.03   n/a 105 autocmod 2.6f

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
FirstGov 2020-Oct-25 03:16 UT
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