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C/2018 C2 (Lemmon)
Classification: Hyperbolic Comet          SPK-ID: 1003566
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

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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 2458258.5 (2018-May-20.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.001806557266361 4.7958e-06  
a -1083.00607841747 2.8741 au
q 1.956512500478245 1.8208e-06 au
i 34.45339330967993 3.9994e-05 deg
node 91.13971561497642 4.5884e-05 deg
peri 134.1384875611278 0.00014738 deg
M -.0003656942054815255 1.462e-06 deg
tp 2458271.723924047784
0.00026577 TDB
period n/a
n 2.765398562182507E-5 1.1008e-07 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      1672  
   data-arc span      272 days  
   first obs. used      2018-01-28  
   last obs. used      2018-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .27461  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-02 22:13:59  

Additional Information
 Earth MOID = 1.06202 au 
 Jupiter MOID = 1.40517 au 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 7.6   0.6 11 2 parameter fit from 1056 observations, autocmod 2.8
comet total magnitude slope K1 26.5   n/a 11 autocmod 2.8
comet nuclear magnitude M2 14.8   0.4 11 from 525 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 11 autocmod 2.8
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
FirstGov 2020-Dec-02 10:53 UT
(server date/time)  
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