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C/2018 U1 (Lemmon)
Classification: Hyperbolic Comet          SPK-ID: 1003592
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

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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 2458914.5 (2020-Mar-06.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000435738401749 9.2388e-06  
a -11463.09572763062 243.04 au
q 4.994911011454037 1.0055e-05 au
i 108.3020015341525 1.8765e-05 deg
node 75.47601960883827 3.0849e-05 deg
peri 180.4025846203977 0.00017679 deg
M -.0004872752749422279 1.5496e-05 deg
tp 2459521.268714481579
(2021-Nov-02.76871448)
0.0017128 TDB
period n/a
n/a
n/a
n/a
d
yr
n 8.030659183846585E-7 2.554e-08 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      1522  
   data-arc span      729 days (2.00 yr)  
   first obs. used      2018-10-27  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .45007  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-30 21:14:33  

Additional Information
 Earth MOID = 3.98104 au 
 Jupiter MOID = .318825 au 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 5.3   0.5 29 2 parameter fit from 1224 observations, autocmod 2.8
comet total magnitude slope K1 10.   n/a 29 autocmod 2.8
comet nuclear magnitude M2 9.7   0.3 29 from 203 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 29 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 29 autocmod 2.8
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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