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JPL Small-Body Database Browser
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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 2458602.5 (2019-Apr-29.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000359729898089 4.5452e-05  
a -13891.50906075464 1755.4 au
q 4.997191138728777 8.665e-05 au
i 108.3009078734515 3.9738e-05 deg
node 75.47936229587101 0.0001683 deg
peri 180.3678127663531 0.00054407 deg
M -.000552999766328183 0.00010481 deg
tp 2459521.139284767744
(2021-Nov-02.63928477)
0.01555 TDB
period n/a
n/a
n/a
n/a
d
yr
n 6.019770496403229E-7 1.141e-07 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      492  
   data-arc span      402 days (1.10 yr)  
   first obs. used      2018-10-27  
   last obs. used      2019-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .47442  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-09 08:45:28  

Additional Information
 Earth MOID = 3.98214 au 
 Jupiter MOID = .316153 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 6.6   0.6 9 from 340 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 8.5   n/a 9 autocmod 2.8
comet nuclear magnitude M2 9.8   0.2 9 from 91 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 9 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 9 autocmod 2.8
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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